I actually had a thought about the design- which explains why it needlessly mean someone has to die. It's specifically the EMERGENCY restart that's inside the reactor- the idea is the reactor's only supposed to be restarted that way if it absolutely has to. (essentially, if they figure out the problem, they can restart the reactor externally- the internal restart is for "ignore the problem because it is that big of an emergency we can't fix it properly" not "get the reactor working again- I can't be bothered to wait for it to be fixed") As such, frankly, I have little sympathy for Aimee- she only suggested anything other than an emergency restart when it would be her that had to die, when most would have suggested it instead of ordering Sarah into the reactor- and would have all but demanded it before sending Briar in. Janet O'Malley, however, is even worse- I imagine almost all Captains would think twice before sending the Chief Engineer into the reactor to die.