Catching someone else off guard is a little fun, after all the off-guarded-ness she's been caught up in, and she barks a laugh at his expression. It's not a pleasant laugh, but it's also not too cruel, and she sets her servos on her hips, regarding him with curiosity. "Now, the funny thing is," she tells him, "I'm pretty sure he had that name, too, but he definitely wasn't you. Isn't that weird?"

The voice, the shape of his stance, his demeanor-- yeah, this was a different person, she was certain, as different from the Optimus she'd run across as she was from her brothers.

Slipstream isn't a great hand at 'cordial', but she does reply to his introduction with a relatively friendly, "Name's Slipstream. You from this place?" She waves a servo, indicating the city, or maybe this Cybertron, or maybe any Cybertron; she's from none of them, so the topic is of interest.