I forget that the NFL makes referees available to the media pool after the game, which is honestly about the only thing the NFL does better than other leagues at anything regarding officiating. After hearing Clete Blakeman's insistance regarding the helmet-to-helmet penalty, I went and actually looked up the rule: There are two 'helmet-to-helmet rules; one for intentional, unimpeded contact to the head area, which is an ejectionable offense, and an 'unnecessary roughness' version where intent doesn't matter, it's just 'forceable contact to the head area'. The Detroit DB was called for the latter, which does seem to fit the letter of the rule. You can debate whether a DB going for the ball should be a mitigating circumstance, but that appears to only be part of the college rule, not the NFL. In short, I think that penalty was correctly interpreted, just IMO.