If he hits your rear wheel, you don't go down, he does. My brother-in-law was in the public crit at the RBC two years ago. Swerved to miss two bikes that had tangled up, and his front wheel clipped the back wheel of the bike in front of him. The bike he hit didn't even break stride, my bro-in-law ended up with a helmet cracked in half and a ride in an ambulance. Managed to wreck both of his wheels, too.
If he had hit you, the only way you would have known is if he fell on top of you.
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