If having a gun trained on him wasn't enough to stop him in his tracks, that look on his face was. Heero had never seen this Duo look at him that way before. The Duo from his world hadn't even. He hid his surprise behind his calm veneer, eyes on Duo.

"Put the gun down, Duo. You're not thinking straight."

Taking a step back, he kept his eyes on the gun, working out the best methods in his head to disarm Duo. The first thing to try was talking to him, snapping him out of whatever messed him up like this.