After Mike Weaver hit him in the back dangerously close to the boards, Milan Lucic responded fiercely and swiftly, cross-checking Weaver in the back and then going for his head while Weaver was down on the ice.
Despite what the Florida broadcasters in the video above say about it, the Mike Weaver hit did not look "clean" at all. It was a cross-check in the lower back, pushing Lucic's face right into the boards. That's not even CLOSE to acceptable.
Weaver didn't get a penalty on the play, presumably because the officials on the ice didn't see what he did, or possibly because they are idiots. Lucic got a two-minute penalty for roughing, two for cross-checking and a ten minute misconduct shortly after for being unacceptably angry.
I'd be mad too. Lucic's response wasn't okay, since cross-checking someone in the back and going for their head is dangerous stuff, but his anger at Weaver's initial hit from behind is understandable.
The Bruins won the game 4-1.
(credit to CBS Eye on Hockey for the video.)