I’ve seen the animation you’re talking about twice (excluding the cut scene), and both times it’s when the room loaded faster than usual.
I agree, The Spliced Hammer has a moovest that makes sense for the Icebreaker, they literally just need to use the same animations, when you attack with this hammer you grip it at the end of the handle like it was a sword
And the Icebreaker moveset would actually go well with the Spliced Hammer so they could even swap them, although that moveset is so bad that it’s better if they take it out of the game. On the other hand other weapons have similar problems too…