From the video, my perception is Girard made it clear he wanted to go towards Rinaldo. Was it just for a tap on the back to say "hey man watch it", or not, that's up for discussion. But in today's NHL, after a hit too often people jump on the player making the hit. I get RT's argument, and am leaning more towards that the more I think about it. But to defend Girard and his path towards the boards, but magically take the time to take a stick to the back of Rinaldo, I'm sorry, not much defense there. He'll think twice about that for sure unless he's willing to drop the gloves and throw some punches.
If Rinaldo didn't turn around and react so quickly, this wouldn't have been an issue. It sucks, because Rinaldo has been clean so far this year. He's stepped up when we needed it, and has been a fuel that we needed.