I think he pulled him because he got dinged up.
Lets be realalistic here. We know AM isn’t the problem (although I still don’t think he’s running anywhere nearly as well as he did last year, even in the open field where the OL is irrelevant), but Vedral has nothing to be ashamed of either. He played well and had them in scoring position in the first half, only to have penalties derail them.
I honestly don’t think we lost much from the QB position tonight. Although Vedral did hold the ball too long several times.