Conversion, wasn't it?
Munster player jumped to block to ball and landed heavily on Steenson, clattered into his head/neck.
Referee said it was accidental because it was a legitimate charge down attempt but he definitely knew what he was doing, it was a "I'm just gonna punch the air and walk forward, if you get hit it's your own fault" situation
The collision was way after he kicked the ball, as well. If that had happened from a kick from hand, rather than the tee, it was a definite penalty, maybe more.