Sounds like there's just a misfire somewhere and they're gonna go it and jolt the muscle. They'll either A) just 'kill' the part that's causing all the problems, or B) might just give it a quick shock to see if that sets it back in rhythm-if not, see A. But you're right. It's a pretty standard operation and as long as he's strong and otherwise fairly healthy, he should be OK.

I'll say a prayer, and best of luck. :)