Guild Wars 2

There is a bug where if you complete the 2nd lazers too quickly (before the lazers actually start spinning). You will no longer be able to interact with the mechanic where it stops them from spinning. Though it will still open the door, but it becomes difficult for the NPC to get through.

Eventually the NPC will come through as resurrecting somebody gives immunity for 3 seconds or so.

[If your wondering how I have manged this]

Basically as a Thief (you can also on a Mesmer or any other classes that can teleport) teleport to the middle of the first lazer puzzle). I then had the “Drink” steal where it gives me immunity for 3 seconds allows be to by-pass the first puzzle. I then aim with my teleport (short bow “5”) to the ceiling for the next floor you need to aim in the area where the mechanics are, where you can interact with them. You need to move slightly up the ramp before you do this.