We've talked about this in the past, the NFL is massively hypocritical when it talks about preventing concussions. The only players the NFL cares about protecting are QBs and WRs, as far as the rules are concerned. That's four or five guys out of the 22 who are on the field on any given play. If you look at the replay, Ridley is the one who drops his head and causes the helmet-to-helmet contact. If Pollard had been knocked out, it also wouldn't be addressed. I don't know if the announcers have been directed not to talk about it or if they just feel like they don't want to bring it up because it's a "legal hit" but obviously not a clean hit and would thus be awkward to celebrate or defend.