The owner of the garage obviously does not want you flying over his property... So the answer is NOT to start harassing him more with return flights. The Quad deserves to get shot down if you continue to irritate and harass the owner. Not saying that dischargng a firearm in the middle of a city is legal... But that's not going to stop him. You are lucky he does not use a shotgun. Or your quad would be history.
Hey, why don't we decide not to spy on people. That isn't why we should have drones. I would call you a stalker, when you keep comin back. What gives you the right peer in on this guys privacy? He don't blame him for shooting at you.