What dream? What the fuck? Why the hell was BB's arm suddenly a tentacle and trying to kill her, it was hard to say which of those two questions made less sense actually.
There was a pocket knife in her belt, and a leatherman hidden in her boot witha number of tools other than just a short blade because you never know when a screwdriver or ruler could be needed. The latter was in her hand before she could stop it, but she stopped short of flipping out the knife because freeing her friend might mean stabbing her.
Raven was unstable, but not that much, thanks.
So instead she grabbed for BB's elbow, trying to twist the limb away from her friend. A basic hold that she had been taught right around puberty that was usually very effective. You know. When magic wasn't involved, "Try and calm down BB! Focus!" Or something! What the fuck dude?