Legacy Particles Follow Box Collider, Not Mesh

Hello. I'm working on a little project where a character shoots a fireball at another character. The other character is supposed to turn into a ragdoll, burst into flames, and get thrown a couple feet. I've got the ragdoll and throwing down, but the flames are a problem. I'm using legacy particles to match the flames to the model, and I can get the flames to show and follow the mesh around. However, when the character turns into a ragdoll, the particles start following the box collider (which is used when the character is in animation-state), and stops following the mesh and the ragdoll colliders. This is a problem because the box collider is deactivated and promptly drops down into the ground. Any explanation/help would be great appreciated. Thanks in advance!

Here's a picture showing the collider setup: