I've tried prayers for engineers and it doesn't work.
As for Xago, yeah, keep him in there because Ting's going to rush up and check on him whilst the crew rush off towards the infected room. The engines aren't down, by the way - I think I said it in the first PM(?) but the auto-pilot's simply been turned of to avoid further damage. It's an automatic reaction to getting hit, all of the engines are currently stable.
EDIT: I DIDN'T.
Forgive me, that tends to be a running theme in my posts recently, I'm in a rush to get them out there so I end up thinking "I've already typed that!!!!" and I haven't.