Merlin was thrown into chaos, wanting Zach to stop but confused by his power until he didn't know what was the right thing to do.
He winced at the tone, flushing at something he'd never seen as a problem before now, but the final question threw him. "Why? Why do you think. I've never..." he trailed off with another shudder because he knew, suddenly, that Zach would be the one to change that.