If Tengu generates approximatly 40 times the energy of a bullet, than if it hits something than it will have approximatly 40 times the energy of a bullet going into the other object, and a force forcing in the insides which could destroy electronics, assuming that all the energy from the spinning shell is taken out at that instant, without wastage due to friction/sound.

So the moral of my story is...

...Go Flank Attack