Mike Mitchell block in the back penalty?

Looking at that clip, Mitchell wasn't watching the play all the way through. Looked like he was lining up for the hit to make it a legal and hard as possible. Doesn't look like he was paying attention to whether he caught it or not. Which is a problem itself, because if Shazier doesn't pick it off and the receiver misses, it's a defenseless receiver penalty.

The James hit being flagged and picked back up was worse IMHO though.