The Relentless manages to muster enough power to get the Warp engines to open a warp tunnel for them to get to Carpathia, when they entered warp, Erex started to push Engineering to get the Shielding generators online with auxillary power units.
Engineering: Here is the problem our Auxillary power is being used to power our warp drive, and our Auxuillary engine units are acting as Warp Drives, this is going to put a strain on our Auxillary engines, when we get to carpathia we may get to a shipyard before our drives fail.
Erex: Can you give me enough weapons though?
Engineering: Your not listening....
Erex: I am listening, we need to have weapons can you give them?
Engineering: yes sir, but we may have to cut power to other things.....
Erex: Like what?
Engineering: If I give you power to weapons I may have to cut power to the engines as well as artificial gravity we took a much bigger hit then expected.