Warwick and J4

I'm not sure what happened, but I was Warwick jungling in a game and the enemy jungler was J4. I tower-dived him as he E-Q'ed out, and somehow my ult was still working. So, he was supressed and taking damage while he was, like, a Tower across from me. It looked awfully funny because I was still able to move, so I was basically running while pawing the air and he was dying (I got the kill). This happened a few more times in the game so it's not a 1-time glitch. I really have no idea what happened, but Rito, pls fix.