Last night me and my friends killed all the Wizards at the bridge and tried standing on the plates but nothing happened. We made sure there were no wipes. In the room where you can scan the pillar that mentions about moving inbetween dimensions, as long as you stay in that room you can kill everything, at least everything on the other side of the bridge. We forgot to cross back over the bridge after killing the Wizards to see if it was turning sadly but also, after you jump down into Croats chambers after the thrall way where you can kill the death singers for the grimoire, there's a scannable statue to your left which mentions "it's a symbol of crota, I don't know its derivation but to me it says "you're going the wrong way" but I'm just following you." Just like in the lost to light mission if you fail to do it without wiping you can scan the door that leads to the lift that mentions "the fallen were here." I'm thinking it's an unreleased exotic but there has to be a secret there.