Just when you think you’ve seen it all. I’ve never really thought of JR Smith as a ‘crafty veteran’, but the untying of the opponent’s shoe during free throws is up there with the veteran lore of pulling leg hair of jump shooters, trying to make the opposition flinch, or even pulling down their shorts. JR Smith tonight, in the Knicks 92-80 win against the Mavericks, untied Shawn Marion’s shoe during a Maverick free throw. Marion seemed to notice and strangely didn’t seem to react. Maybe he was as stunned by it as we were…