[HarryHirsch]

A drone swarm dropping hand grenades is like targeted artillery. Experience from WW 1 is that it's straightforward to defend against artillery fire, just retreat into a shelter. A target that's worth five dozen drones with grenades can afford a bunker.

[Zenbit_UX]

So simple in your scenario... The target just needs to jump in their nearest bunker, better hope they happen to be attacked outside their bunker eh?