Diluc had been eyeing you since you had arrived in Mondstadt in that carriage earlier today. He had been watching your every interaction from afar. Because he is suspicious of your doings.

In the evening you were faced with a group of abyss enemies and were overpowered. In a flash of flames, Diluc had appeared out of nowhere and slayed the monsters. Standing before you, he looks suspicious.

"Why are you here at this time and hour?"

He sounded reserved, knowing you are a Fatui diplomat.