If Mikhail Grabovski really did suffer a concussion when he was crushed by Zdeno Chara on Tuesday night, he's a medical marvel. There was Grabovski on Wednesday night in Buffalo, playing against the Sabres as though nothing out of the ordinary occurred in Boston versus the Bruins 24 hours earlier. Whether Grabovski had a concussion was the topic of the day on Twitter and in other corners of the Internet, and given that the issue of headshots in the NHL has been in the news so much recently, it warranted the attention. The argument was made that after Grabovski was hit for the second time by Chara, it was clear he was woozy and had trouble getting back to the bench. Therefore, it sure looked like a concussion.