The drone pilot is aware of his altitude.
Helicopters are loud.
The drone pilot should drop altitude and return to launch point if he hears aircraft.
Not to mention the phone apps that tell you of FAA regulations, based on geographic location.
A friend who purchased a quad-copter went through the FAA test — which is basically the same exam they give to pilots, minus the flying bit. When you’re flying a drone near an airport there are altitude restrictions based on ‘how far’ you are from the runway. Think of it as an “inverted layer cake” protecting the glide path for the aircraft operating there. You are also obligated to phone the tower to advise the airport if you’re withing 5-miles.
All of this stuff is mandated now, but very few drone operators are even aware of the rules.
I thought there was a 400 ft limit on drones.
The drone pilot was probably a whacked out mussie trying to bring down any aircraft he could ram his toy into...