When I say "clean block"... I'm only intending to say it wasn't "dirty".. or a "cheap shot".
I agree with you that, technically... Welker's hit was a fraction of a second too early. By rule, that SHOULD have been a penalty.
However, I think the timing was SO CLOSE, that I give the referee the benefit of the doubt. It was very hard to tell in real time. Especially if, you were watching the ball.
Ah. I understand.