change textures on the fly, could help, since the clothes and the soldier should look burned.
Studying the movements of the soldier, which frames of animation, used to turn on itself ?. For example when the soldier turns to face the player.
Playing with these frames in a loop, and add a randomize function so that the rotation is random and more realistic; besides the speed of rotation, it should never be constant.
Again study the movements that used to die, which frames of the animation, use the soldier to die?
And finally in a perfect world. the soldier's body should be singed and smoking. But this is a tall order.
These are just ideas, taking into account the resources currently available.
3com
Laptop: Lenovo - Intel(R) Celeron(R) CPU 1005M @ 1.90GHz
OS: Windows 10 (64) - Ram: 4 gb - Hd: 283 gb - Video card: Intel(R) HD Graphics