I don't mind a penalty but a card was a bit harsh. He's clearly jumping for the ball, and you can't try and penalize that out of the game. So long as it's two players in the air challenging for the ball, it should be a fair contest - it doesn't matter that one was being boosted and was higher. Otherwise, what can a player chasing a kick do? Would they have to concede the catch and automatically defend? I'd like to see more responsibility put on the boosters' shoulders in open play like this to ensure he comes down safely, or maybe they stop boosting in open play altogether.