This is the forum for helping you out if you're stuck in Grimrock 2 or if you want to discuss about the mysteries of the Isle of Nex. Warning: forum contains spoilers!
I'm stuck at the same spot. I walking around in the level, and each time i come back the following plate is up. I managed to get the key, but it's so long, must have another way.
Now i'm walking to put the right plate up...