Leonard realizes that he's not actually doing any good here; that he's just kind of awkwardly hovering, trying to reconnect with something he'd thought he'd lost. He knows he ought to go ...

... but he doesn't.

Instead, he grabs Jim's desk chair and settles in it, arms over his chest, watching like he's evaluating Jim for a progress report. He'd almost look stern if he didn't have that softness to his eyes.