I didn't even realize that line was taken out, because I was too focused on the fact that they force you to pull a weapon and lunge at him. Trying to attack/kill a companion is a very significant choice and you're forced to do it even if you choose the non-violent option beforehand. Maybe they did this because it's funny watching him just slap the stake out of your hand, but even if I liked everything else in the scene being forced to pull a weapon on him would ruin it for me.
You're not forced to draw your weapon when Laezel or (potentially shadowheart, if you don't recruit her and she shows up at your camp) try to kill you. Or even when you meet Astarion and he threatens you with a knife. In all of these scenes you have a choice between responding violently or nonviolently, and the following cinematic reflects that choice.
In the new bite scene you attack him regardless of what dialogue option you picked. It's really odd to me.
But yes, I hope the line being taken out is a glitch.
