Ux Utanar's hand was already halfway through when Delja's snapping command reached him. He doesn't need such an external warning, though: the wracking pain in his hand gives him all the intel he needs about that sphere. The Dragonborn promptly pulls his hand out of the device, and shakes it for a minute or two to cool it off. No harm done, though - Bahamut's blessing wards him off from fire. He smiles and turns to Delja, showing his hand.
"The Platinum dragon protects his servants, however careless they might be. But just in case his attention is elsewhere next time I'm about to do something stupid, I'll remember to listen to your opinion before acting."

That being said, Ux Utanar comes back to wait before the sphere.
"And what now? I'll tell you, if Myriad doesn't come out of here soon to tell us what's beyond that sphere, I think our best bet is to get back to the scholar I have seen in the room just above and ask him some more info about Teru. Because I can't quite see what more we can do in here."