It would be great if there was another way he could meet Tav without pulling a knife, like if Tav had a high enough passive perception to say "Hey I can see that knife of yours mate. You pull anything and you'll be Eldritch Blasted into Avernus. "
He's supposed to be this charming rogue, but he can't try conning Tav into doing instead of violence
I kept an open mind despite the knife. What he did at camp, though: that was his death sentence.
One thing I haven't figured out yet: Is someone teleporting Astarion's body to each new camp we set up, or is he just playing dead and stealthily following us whenever we relocate?