The glass barrier you could break but it would take a bit of force lol.  Still, both levers will deactivate the orbs, but only one will deactivate one orb hence why I have it set up as I do.  You had the puzzle figured out too damn easily by the way Elf lol.  I'll have to throw a curve ball somewhere, just not sure where or if I even will anyway lol.  Oh, I know!  I always hated the things when they fell down from the ceiling and if they landed on you they dropped you back at the entrance of whatever temple you were in.  Can't think of what they're called to save my life though.