The moment Tony sought to pull past him was when it was Cayde's turn to make a grab for that tail of his. Turnabout was fair play, something something...

A yank, a playful poke- Tony wasn't the only one who liked to employ distraction, and if it was enough, Cayde'd throw himself through that window even if he had to push off of Tony to do so. It probably wasn't going to be a gentle landing but he was metal, he could take a wall better than his pal would.