FenderBumper
The "good old days" ??
I think I know what's going on. nascar maved a bunch of downforce from the spoiler to those shoulders on the rear quarter panels. When 2 car close together the way Edwards and Hamlin did, that downforce goes away quick. Then the 21 closes on Hamlin and pushes that air bubble over Hamlins spoiler and he got a big push from behind and lost it.