"Helmet to helmet"
What a copout.
What it's going to come to is defenders just putting their shoulders in the middle of a QBs back.
Having helmets touch should not be a reason for a flag. I'm serious, you are going to see a defender literally put his shoulder square in the back of a QB and you're going to see someone really get hurt.
It's getting out of hand to see a flag every time helmets come in contact.