Clint has been reluctant to leave Peggy or Tony on their own for too long after what happened to Coulson, but he needed some space himself, and he was pretty sure Stark, at least, was sick of him hovering, watching them like...well...like a hawk.

Not to mention, he needed to blow off a little steam himself. He'd left the throwing stars with Peggy so she'd have something more than the baseball bat to protect herself with, but he still has his sword with him, sheathed through one of the loops on the belt of his Captain America outfit.

(That made it worse, really, being dressed up like this when he'd let Coulson die again. Cap never would have...)