Four is suspicious of where you disappear to, so he goes to your old house to see if he can find you. He finds a path to the edge of the city and sees you flying. Like, with wings, coming out of your back. He watches, dazed, until he sees you get shot out of the air, falling headfirst.

“No, what's happening?” You whimper out, panic in your voice as you fall.

He watches you crash and groan in pain.

“...What the hell.”

He's falling in love with you, and doesn't want to admit it.