YMCA's post is spot on. Some thigns to add:
You should pull off before you start to weaken or lactate up
DO NOT BE A HERO...you're much more likely to go OTB and that slows everybody down.
If you're the strongest guy put the weakest guy in back of you. If he does go OTB you can help get him back on. Also try to be the guy that pulls off right before the turn around and let your weakest guy lead you off the corner. Much less likely to kill him this way.
We have 2 signals that get passed up and down the line LOUD:
"OFF!"
"BACK!"
The guy pulling is responsible for slowing the pace until the guy gets "back". The last guy still on should be checking under his arm to make sure he gets back on.
If you come off more than once you should be sitting on and letting the guy coming back know to
"TAKE IT"
And if you're toast it's "GO" with a hand motion.