Mass Effect: Endurance, Part 4!

You should probably read parts 1-3 before this one. Just saying.
Anyway, this is basically the part before the reason i kind of started this story in the first place. It was not meant to be this long, detailed or have many characters.
Parts 1-3. http://www.holdtheline.com/entries/mass-effect-endurance-parts-1-3.309/

Here's some stuff i wrote about character classes too, from the enemy's perspective.
You don't have to read it, its just for funsies.

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Adept:
Your team has spread out in the area, wary for trouble, scouts report someone alone, you set up the ambush perfectly, waiting to spring the trap. You spot the woman, strolling casually toward you, you smirk and tell everyone to open fire over the radio. She reacts instantly, diving straight for cover. Your team lays down suppressing fire, eager for the battle to be over. She pops out of cover and throws grenades at your left flank, where 2 members of your assault group are. They try to dive out of the way, but the grenades send them flying into the air with biotic power. The woman then casually shoots them out of the air with her pistol, glowing with biotic power before she sends a blue blur arcing toward the snipers behind you. They catapult into the air helplessly before they explode in a large scale biotic detonation.
Your scouts that spotted her have returned and open fire, forcing her to dodge their shots out of cover, you open fire once again, hoping to take her down before anyone else dies. She quickly comes to a stop and a black hole appears behind your scouts, throwing them into the air. The woman whips out her hand and another blue blur slams into the scouts, throwing them off the side of a cliff, their screams echoing into the radio.
By this point, there are three of you left, you manage to take down the woman's barrier before she gets to cover, and decide this is the chance. Ordering the others to charge down the right side, you take the left, hoping to catch her by surprise and finish her quickly. She pops up and opens her palm. Waves of force blast out, hitting your fellows, throwing them into nearby crates, she finishes them with 2 quick bursts from her submachine gun and turns to you. You run, jumping over the cover in your way, but are suddenly yanked backward by an unseen force, as you fly helplessly, you see the woman's biotic corona flare as you are torn apart in a biotic explosion.

Engineer:
Your patrol spots a lone woman, you figure it will be easy, shes just wearing basic combat gear. You wave them forward and tell them to open fire. She waves her omni tool, you laugh, thinking she's trying to surrender.
You shoot at her, and your weapons overheat. She begins to shoot at you, and your shields don't work. Your armour is burned away by a napalm bomb. The mechs you brought along suddenly gain kinetic barriers and start shooting at their masters twice as fast. You try to hide and she sends a drone after you that electrifies you and forces you out into the open to be shot. You run but the drone begins to fire missiles! Finding cover, you peek out to see one of your buddies charge in and think that shes done for. Suddenly she deploys a turret and he is immediately mowed down. She launches another napalm bomb into the air and it arcs toward you, you leap and dodge it at the last second, only to look up and see her drone hovering over you. Your friends are dead, burned, electrocuted and blown up, you're the only one thats left, and your shields go down immediately after they're recharged. You flee, but know you cannot escape....

Soldier.
The woman in front of you is heavily armored and is carrying more weapons than you've ever seen someone carry, you and your platoon start to open fire but in a fraction of a second, she pulls out her assault rifle and sweeps it through the air, firing wildly. You laugh, thinking shes just wasted her ammo, but suddenly there's a number of dull thuds behind you. You don't have to look; your HUD tells you half your squad all just flatlined. And shes just finished reloading. Your Krogan rushes her, she rolls and pulls an omni blade, stabbing your krogan pal right in the face. She then kicks the corpse at you with astounding strength, forcing you to scatter. She runs straight up to your point man and bashes his face in with a rifle. Your batarian rushes in and attempts to beat her down, she swivels and pulls out a shotgun and blows your buddy's head clean off his shoulders. You call for a retreat and attempt to find a choke point, but you hear loud shots ring out, you watch as the guy in front of you stumbles, then his head explodes in a spray of gore. An incredibly loud shot rings out and someone else dies, this time in a firey explosion. You double time it when you feel a shot go through your leg, you try to walk it off, but you start to freeze! When you cannot move at all, you hear footsteps, the cocking of a pistol and everything goes dark in a loud bang.

Infiltrator.
Your platoon is walking along their patrol, it's your turn on point, nothing's really out of the ordinary, but you think you hear a far off gunshot. Confused, you wave your squad forward. Then you hear the sound again, closer, but this time a spray of blood hits you, you turn back to find that two of your men's heads are just gone. You all dive for cover but another of your men dies, shot in the face even as he dove for a rock. But you saw where the shot came from, you turn and open fire as the distant sniper ducks back under cover. Your team coordinates fire on the spot, keeping the damned sniper pinned as you advance towards their position. Then there's the sound of a sniper rifle, and another one of your friends heads bursts open like a ripe melon. Your men start firing on the new position and you force them to coordinate to keep both of the snipers pinned down. There's another shot and someone else dies and you can't find the sniper. Everyone scatters, firing wildly. Terrified, you and a companion hide in a small alcove of rocks, huddling together out of fear. You watch on your HUD as one by one every other member of your patrol goes dark until it's just the two of you. Where's the sniper? How many are there? Then you realize your friend's neck just snapped and someone suddenly blurs into existence beside you, the barrel of a pistol coming up for your head.

Vanguard:
Your band of mercs ambushes this stupid woman, laying down some serious suppressing fire. Suddenly, your companion freezes solid and, in a flash of blue light, the woman turns into a blazing blue comet of death and rams into your friend, sending them flying through the air until they slam into a wall and shatter. The krogan on your team starts to charge the chick but she swivels on the balls of her feet and there's a sound like a cannon as half of your krogan buddy's face just disappears. She then turns towards you, pumping the slide of a shotgun built exclusively for krogan and a blue biotic corona flares up around her. She rockets toward the guy next to you, turning him into a smear and sending you flying backwards, you look back, aim your rifle, but watch in horror as she slams the ground and everyone around her is thrown into the nearest wall, bones breaking, organs crushed. She turns toward you and you close your eyes and pray for a quick death.