With all of this said and done, in response to the OP, No, it's not ok for Wolves players to do it.
It gave us a lead and influenced the game so goody for us, but these incidents have gone against us this season.
But even so. I think he knew what he was doing and looked for it. Don't see how the defender can avoid an attacking player running at him, swerving around him, then falling over as I'm standing still and bang! he's hit my knee.... oh and now he's fallen over. Maybe I should be somewhere else out of the way....