Here's a video clip of a massive DC-10 Air Tanker firefighting aircraft making a drop in Utah a couple of days ago. Note the lead aircraft, helping the big plane position itself for an accurate drop, then getting out of the way as it comes through.
That was a great high-precision drop by the DC-10. If the load of fire retardant had hit those houses, the kinetic energy of the weight of all that liquid would probably have collapsed the roofs. You can see what a much smaller load does to a vehicle in this video clip.
I wouldn't like to be standing under that!