That looks pretty good!

Bound and in trouble, then SUDDENLY WEREWOLF!

Great animation, the transformations coupled with what looks like some kind of restraint bursting has a really dynamic feel to it!

I won’t claim to be an expert in this topic, and I might get some things wrong, but removing frames in between points, like the start and finish of the change makes it seem faster. The import part of it is key frames, which I don’t rember how to determine, but the amount of frames between these key frames changes how fast it is interpreted to be, as those key frames allows the brain to automatically fill in the gap of what happened between them, even though those frames do not exist. Another way to show fast movement would be motion lines or blurs, as they allow you to cut out more frames as they make sort of a after image effect, as seen in the animation provided. They could be more effective here, as they linger for too long or the motion they accompany doesn’t seem fast enough for them. I think that it is both, but either way why, it could be improved. I think one way to improve would be to be take an animation that you have made before, and see what frames could be removed, and without adding any new frames. I would like to once again mention that I am not an exspert, and this advice comes from what I remember from years ago, and may not be fully accurate.

A good thing to look at might be the channel new frame plus. While it mostly focuses on animation in video games, it is still a channel dedicated to analyzing animations and how they work.