It appears that no one was really physically hurt in the crash, but that doesn't mean there was no damage done. Cavendish was the big loser on the day and took a significant hit to his green jersey point total and standing. He now holds the fourth place slot in the green jersey competition falling a spot from where he started the day.
My only advice would be to put your money on Cav teh next time he has a chance at the line, because a pissed off Cavendish is not often denied a win. That chance will be tomorrow's Stage 5 to Saint-Quetin. Book it.