Lemm is admittedly very preoccupied with the stone. He hears the ominous rattling, but it takes him a second to register where it's coming from - and by then it's too late.

"Gah!"

The sudden rain-down of fountained water catches him by surprise, and Lemm finally yanks his hand away from the stone to march over to join them.

"What are you doing? Was that on purpose? Turn that off!"