So... I've not seen it yet, but it sounds like you're saying that in the new bite-night scene (back from being missing, I presume), you have a bunch of initial reaction choices, but no matter what you actually choose, your character always (at thee very least) grabs a weapon and threatens him, not matter what?
My guess would be that either:
1) They don't want to have to branch out the cinematic visually
2) they haven't finished working on the cinematic yet.
If we can, in this sequence, stab Astarion with a wooden stake, and he dies from it... That's Not How Vampires Work In The Forgotten Realms Larian!
So how about an option to drag him over to the river and down/melt him in it?
