Comment I can see how you could think it dangerous. (Score 1) 200
But I can also apply physics and see how the danger is very small.
The biggest point is that the sky is big and both the shells and the drone are small. The chance of the two coming into contact is negligible. The risk of anything bad happening if that happens is also very small - the only thing I can see happening is if a rotor happens to cut the shell's fuse. The shell is too heavy for a fragile drone to have much effect on it.