It certainly wasn't an obvious pass interference on Grimes. Even in slo mo, it would have been a bit of a ticky tack call on Grimes. It was that close.
Don't think a PI in the End Zone is even CLOSE to TickyTack! Even tho it was VERY close, running into a receiver in the EndZone is (to quote Bobby Hebert) "CRUCIAL"! That call and then Bushrod's subtle jump off-sides cost us 12.........not related but still........