I had talked to Nettie (which will trigger Raphael`s scene, I think), then left the Grove and found the exsanguinated boar (which triggers the bite scene). When starting a long rest, Raphael appeared at camp, and the background music for this scene played. When going to sleep (or rather meditating), the bite scene started as expected, but Raphael's background music was still playing, and continued to play the next morning when my character was talking to Astarion.
Other than that, I am very glad that our character doesn't automatically attack Astarion any more.
