1 X: Now we can watch Serron and the alien on the surface of this nearby planet, attempting to communicate with one another.
1 {indeed, we can see Serron and the alien on the viewscreen, standing on an alien planet}
2 X: Wait...
2 Alien: {over viewscreen} Payzu and Kalaja at Banton.
3 X: What is Serron doing?
3 {seen on the screen, Serron is approaching the alien closely}
3 Alien: {over viewscreen} Jopron, puzzled.
4 Serron: {over viewscreen, running away from the alien} I’ve got his wallet! Bring me back!!
4 Alien: {over viewscreen} Zarbo, his dodges artful!

I had to brainstorm with friends to come up with a "Darmok"-like phrase that the alien could utter which clearly meant something like, "Hey! Stop, thief!" while also adequately having that slightly cryptic "Darmok" effect.

Geoff, hitting the nail on the head.