Try saving before taking the lift and quit completely the game and restart it. I'll look into it.
i did try that still not working i don't know whats going on the gun just moves left and right saying no to me and don't shoot XD and i just finish this boss easily
If you previously did the pacifier sequence with the whole brainwashing, it's normal that the ray don't shoot at all as you "broke" it at the end.
oh ok that makes sense so its working i tried it again without getting caught. <3 enjoyed it very much