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Perhaps during the animation you could switch the collision animator to another one at the right size during the animation, then switch back to the old one after?
i believe the aabbox of the node changes with the animation. if ur trying to do exact collision (like with a bullet) i think the ray changes with the mesh too.
yeah the aabbox changes I have done somthing a little like this, also you could check for triangle intersections with your mesh, which may be too much of a performance hit.