Totally lost here. I can't for the life of me figure out how to make this puzzle work. I have all the prisms pointed at the upper pylon but I either can't hit the two conductors fast enough or something because even when it seems like I've activated them all I can't pull the switch and the game won't let me cross this invisible barrier to where Alexander and the big Golem are.

https://steamuserimages-a.akamaihd....40C307BEDF776A5E98E54B010BB5868EF8A8ED5/

That's a picture of what I'm staring at.