You just became detective, after being a beatcop for some time. You're very nervous for your first day. You had drank a lot of coffee, and that mixed with the nerves makes you a little jittery.
You work your first case, and before you know it, you'd solved it. You rush out of the precinct to catch the criminal, and after a long search and a not so long chase you catch your perp.
The perp sits chained to a table in the interrogation room. You watch them through the undirectional perspective glass, bouncing a little on your feet from excitement, nearly having solved your first case.
Alec walks past the interrogation room. He glances through the window of the door, seeing you standing there all excited. He smiles, just a little. Anyone looking at him might think he's proud of you.