hmm, good to have some confirmation at least. Also, what about Sandra's foot, does it clearly show them as now being stationary? Because the ropes are elastic, and it looked like she was continuing to stretch the rope, which would imply that he still had momentum dragging her, which I could buy.
Either way, it doesn't really bother me in the slightest. I didn't pick up on it during the movie, and wouldn't have noticed if it wasn't specifically pointed out to me.
Fireproof - to your point, imagine Avatar, except the stuff being animated is stuff that currently exists in the real world and we can relate too. This movie is 95% animation (most shots I'm pretty sure just Sandra's face is live action), and it all looks photo-real and stunning.
The stuff that really gets me is the interior shots, I have 0 clue how they did that stuff. It seems like there's gotta be practical ISS stuff there for Sandra to interact with, but when she's flying through the station casually, there's no way that's practical....right? This is the first movie in a LOOOOONG time where I'm utterly flabbergasted at how some of this stuff was filmed. This movie shouldn't exist.