For a second Greg really thinks he has gone off the deep end. It's the easiest explanation.

Or, well, until he remembers the actual source. His eyes finally connect with the mirror and its repeating loop, and a great heaviness lies over him. Of course... he should have thought of that... should've known... Greg pucks the mirror up and stares at Steven's image. He looks so close.

He closes his eyes and swallows, willing himself not to break down again. Steven needs him to be thinking.

"H-hey," he greets the mirror. "You heard all that, huh?"