Possible animation issues? It's also possible that one of the texture parts is larger/smaller than it should be.
It can't be the textures, as I'm not using the ones Mastaklo provided. I used the standard Sonic blue texture and Lensho's vertexed Mephiles in both of the matches that caused freezing. I suppose that it could be one of the win animations, as I only saw two of the win animations in the matches that worked. That third animation could be the one that caused the freezing.