Sarah has taken a couple of hits in the meanwhile, but thankfully, she's durable. Were it not a simulation, it'd definitely leave a few bad marks. Still, she catches the shield in time to block the heavy pulse beam, letting her unload with Mjolnir, taking the firing sentinel's arm off. It begins to focus on self-repair, while the other of the last two remaining does its best with its semi-functional shields to block the rockets, taking some marks in the process.

"Focus fire!" Sarah calls, "We only have thirty seconds before the Alpha's self-repair systems will have them back up!" Which is the other part of the insane difficulty of this scenario - like the Mk II's, alphas and omegas get back up.