I am pretty new to this so maybe it's a dumb question. I noticed that when Cavendish was sprinting the finish today, his leadout man dropped the power after his sprint and basically made himself into a wall for anyone trying to come up on the left side.
What are the rules about blocking and interfering with other riders? I assume that for example, you would get in trouble for having 3 riders in the middle of the pack grab the brakes and force a split somewher. But it's a slippery slope between that and getting tired and slowing down. Has any team ever been caught or suspected of intentionally crashing as a planned strategy?