"You WANT To Do This For FREE?" I Was Just Driving By And Offered My HELP

At the end of a working day coming home I saw a house in the front yard which had a small not overgrown Yew hedge, so I decided to offer my free help in trimming the hedge. The homeowner was very surprised by this and with a little hesitation still agreed. With the new Stihl trimmer I trimmed the hedge and at some point I heard a loud bang, when I turned around I saw that a car with a horse trailer was driving down the road and the rear ramp of the trailer opened and I was afraid that the horse might fall out of the trailer, so I ran to warn the driver by waving my hand at him but he didn’t see me and drove on, I hope someone warned him. I also removed weeds with a weed eater from the sidewalk and parking lot. After a few hours the owner was thrilled with my work and asked me if I could mow the overgrown grass in the backyard that he hadn’t mowed all year, I agreed, but since it was evening I said I would come back the next day after work. The next day I cut the taller grass with the trimmer, but sinc