He's going to die. 

He's going to die and he's not even going to ever get to know why. He's never going to see the world outside of the stupid school again. His sister will forget who he is and forget about magic and then die at ten or twelve or fourteen, confused and scared and never understanding why.

It's not fair but that's so incredibly besides the point. 

He's in his room, helpless, with glaring New York seniors guarding him and Lan Wangji not making any facial expressions at all, and Lan Xichen just gave him the truth potion and it's twisting his thoughts in baffling directions, and now someone is casting a spell -