Fun or not, as the writer, Jim could always just say Chi’ra happened to pull Chewie in at the last second. No waiting necessary. Coincidence is an excellent tool to use in storytelling, as long as it’s not overdone or too obvious.

Hmm, I doubt that Chewbacca pulling himself up on Chi’ra’s arm would rip the arm out of the socket. Unless Chewie’s intentionally trying to pull the arm off, there wouldn’t be any leverage available to do so. A bionic hand might be able to grip something hard enough, but regular human hands would slip off before any damage would happen.

And now I’m wondering if this is gonna end up being minor foreshadowing for a current or future character of Jim’s. Someone’s likely going to lose a limb in the sequel anyway; I can’t see that parallel to Anakin and Luke losing a limb not happening.