From looking at the animations, one smacks the area near mag with a fist, other pushes the knob on the magazine which helps directing the correct insertion of a mag into the gun, both which have no apparent mechanical meaning.
On one animation it is clear that the racking lever moves, even tho the hand doesn’t interact with it.
And final obvious oddity is that the mag is changed after “racking”, which from technical viewpoint means the gun was not restarted (as the racking lever obviously restarts the gun after inserting fresh mag)
Tho I could be wrong about how the lasgun works.