Get power back
  This might take a while, but any time your low on power, choose your other
  person and just stand there for like 2 minutes (go get a snack or something
  while your waiting). Then come back, and choose the guy that you put away. His
  power should have come up some! But do it in a place where you know people
  aren't going to come and beat you up at.

Hint by Felipe Gerhard - felipe.gerhard@gmx.net