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So without any further ado;
How about some stunt men that do somersaults or acrobatics before landing.
For example, a (easily disposable) stunt man (comes in a pack of six! ) may be in the proximity of an explosion and while getting blasted forwards and upwards the body rotates (backwards or forwards) in the air and then the stunt man lands on his back or crumples in a heap.
Another example, might be that when a stunt man is shot or hit or whatever that he lifts off the ground a little but spins on a (relatively) vertical axis, like a top before falling to the ground.
Just ideas that could add some spice to the background of some fight scenes etc.
I would suggest dressing them in non descript clothing/costume too, but that can also be changed later.