As Kuhl returns to the room, he looks at the burning key he had used. Is it still glowing hot? In any case, once the ward is dealt with, he removes the wax from his ears so he can again hear his companions. He feels slightly foolish. He approaches the door, and attempts to open it -- does it push? Does it have a latch? Perhaps it slides.
After carefully bagging all the broken orbs with as many of pieces he can find with the hope of repairing them someday Zath'ras turns to see what everyone else is doing as he has not heard them doing anything. As he stands there for a moment in odd silence, he realizes why and removes the wax within his ears.