Help! Mannequin Ragdoll Issue With Radial force

I have made a VR Grenade system, that has a radial force explosion.
If I throw the grenade, when It explodes the Mannequin Ragdolls just slump on the floor.
but If I set it to AUTO ARM and place it at the feet of the Mannequins, and either view it in simulated mode of Just plain VR and watch, The Mannequin Ragdoll work just fine and react to the physics force.

Not sure what the issue is but here is a VIDEO showing the issue.