BUG when "Propflying"

If you grab glass, go stand on top of it, and then look up to pull it, your leg will do funky. I think I did it like this if I remembered correctly. But I'm not sure XD I did this in the last map at this moment. The 1 with the wreckingball. Reload map, and reload checkpoint both dont work... Restarting the game does work.

Here is an image: https://www.mupload.nl/img/o3gotzn3kcz.png