PAB Tech (Pickup Animation Break).

On the release of System Override Ubisoft made a patch to fix an exploit using a lagswitch called exit rep. This fix was to make the exit animation need serverside validation. By doing this though they unknowingly unpatched an exploit involving rappel and pickup animations. By going on rappel and picking up a gadget (breach charge,fuze, thermite, osa shield) and exiting or rappel swinging almost instantly right after it would cause a conflict in the server breaking the exit animation allowing you to go through walls. By an unknown change of the exit animation this has been patched for exiting not swinging.