There's quite a bit of movie magic going on there with those explosions. To create them, you would need more than just high explosives that the drones would be carrying. The explosions appear to be some type of fuel based pyro. No way could even multiple drones deliver those kinds of explosions. Consider something like a hand grenade which would be the closest to what the drones could carry, there is a very brief flash but the main effect is shrapnel/force depending on the type of grenade. A relatively beefy drone like a DJI Phantom can carry around 200g and the drones in the film are consumer sized so lets say they can carry a similar amount of weight. So that's pretty much around double the charge of typical frag grenade with detonator. I would have thought a fiery explosion wouldn't be anywhere near as devastating compared to a high explosive based explosion. But it's a film and they wanted the looks and the force even if it doesn't really make sense.
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