[canuckrefguy]

I think it all boils down to judgement on what incidental contact is.

There's the philosophy that, on this play, if you can't make the shot block without the knee contact to the shooter's head, then you shouldn't be allowed to make the shot block.

The other philosophy is that the defender made an athletic play that was squeaky clean, and once the shot ends, any non-severe contact should be disregarded.

My rationale for calling a foul here is that the shooter is in a vulnerable position and takes pretty severe contact to the head.

But I totally get why there would be no call - with the blessing of everybody in the building - in a good hard, physical game.