I think I explained my reasoning somehwere on that YouTube video. I was thinking of the lasers as a power source, not just as a signal carrier. I see now that the power comes from somewhere else, which explains the confusion.

And the pulse is because in the first one, the relay being on causes the laser to be on and the relay being off causes the laser to be off, i.e. the same, while in the second one, the relay being off causes the laser to be on and the relay being on causes the laser to be off, i.e. the opposite. It is fundamentally different.

It's not a glitch, a very similar thing has been done in real life. The battery is connected to the relay, too, so standing off of the button does not completely shut off the power.

Very cool! Though a couple of portable surfaces would be handy to get back to the beginning ledge - I'd feel dumb to finally cross the bridge only to fall into the area in front of the exit and get stuck!

Well that's some ways the idea of the laser-only switch I did with a moving platform, but quicker and with a hinger item count I think ^^