Absolutely a facemask (any time you tackle by grabbing the helmet, it is by name a "facemask.") He had both hands on the guy's helmet when he yanked him down by his head. And the worst part is that the ref (correct me if I'm wrong) did one of those jobs where he looked at the play, reached for his flag, but then did a quick "eye contact and body language" conference with the other refs, and decided that the flag would NOT be thrown.
Or maybe I just imagined that.
Correct me if I'm wrong, but isn't it true that plays such as that are not reviewable? If not, I don't know why not. Esp when the safety of a player is involved, as long as they have an official in a booth with expensive video monitoring and replay capability, why not let the guy upstairs call something if it's that clear????!