I just started sparring today (woohoo!) and have the headache and sore jaw to prove it (doh!). While I was in the ring, I wanted to grab my oppoent's neck and give him a good knee or two. Unfortunately, I couldn't figure out how to make it work. The closest I came was when I rushed him against the ropes, but I still couldn't get my gloves behind his head because he was turtling up. When and how can I actually execute this move?