the easiest way to do this get in the corner
1. turn and face the chair
2. go to prone(laying down)
3. stand and jump
4. back to prone
5. stand back up hold back on left thumb stick(360) for ps i dono what ever stick u use to run around with not the aim stick
6. jump
if u did it right u shouldnt move when u jump if so proceed if not repeat 2-6
now just jump and push back at the highest point of your jump and u should get stuck
p.s. this will work for any corner that u can get stuck in