I don't have the scans on me, but Bishop absorbing pretty much all of Manhattan through power lines to take out an already beaten up Onslaught. Yeah, I know it kinda contradicts my previous post, but at least Bishop put him down.
Also, Bishop absorbing all the energies from the X-Men, X-Force, and X-Factor to put down Magneto during the Fatal Attractions story... before ultimately being stabbed in the back by Colossus.