It doesn't take long to find Tris. Sure, she's well hidden but Four knows her. He knows that she goes up high when she wants to think, when she wants to be alone and he should probably respect her desire to be alone, but since when does Four know how to actually boyfriend? Since never is the correct answer here, so he grits his teeth, climbs the stairs and steps out onto the roof. It's not so high but for someone afraid of heights, it's high enough. He shows his fear in little ways: back straightening, shoulders squaring, brows knitting into a concerned sort of scowl (because scowl is his default).

He approaches Tris from behind, moving up to touch the small of her back. "Decide to save climbing the tower for another day?" he says in greeting, fingertips resting ever so slightly at her back.