he is going after ya boi ren. but yeah, he's going to be picking up on that hot trail and trying to get him back to alliance court for ~desertion~. but otherwise, maybe vash and julian have met up in some seedier places in the system? like they became acquainted after jules asked him for a very specific escort and it ended up being a quick and easy business relationship. i just imagine julian listed as like "guy who plasma knifed someone in the throat NO I DIDN'T SEE IT" in his iphone equivalent.