Right up until the alarm went off, Clu was unaware that anything had changed. After all, he could always see, hear, and otherwise sense himself with no problem. But just because it had been awhile since the last time he'd gotten caught sneaking around didn't mean that he didn't immediately recognize security alert when he heard one.

He briefly considered teleporting away or otherwise fleeing the scene, but to do so would only make it seem like he'd been there to cause trouble, when in fact the opposite was true. Probably better to try an explain himself, however difficult that might be. As the User he'd seen before came rushing in in an apparent panic, Clu turned to face them, holding up his hands in a fairly universal gesture to indicate non-threatening status.

He offered them a very sheepish smile, hoping it would be further proof of his lack of threat. "Uh.... greetings?", he said. Because really what could one say in a situation like this?