If you go into mouselock and rapidly press a or d, you can walk on thin air. You’ll notice that I fly in one point in the game, but I’ve tested without having Kohl’s fly enabled, and a place without Kohl’s admin even, and I can still walk on thin air.
Buddy reported this about a month ago, and since I have tried doing this but I just can’t do it 
CodeWriter has a fix for this, should be out soon, if not already.
So the mouselock was basicly a noclip (only the fly part)
No. It’s known as the Fly Glitch. Jumping while rapidly selecting a tool and holding A or D in MouseLock causes the tool to spawn under you allowing you to jump on it.