Well, the last guy I helped out like that came walking up to my job site bloody and asked for help with a tree he was doing around the corner. He had done something to screw up his saw, Not sure how he bloodied himself but he said he had a tree notched and nearly cut through around the corner and his saw had quit working. I left my job to go see what the deal was because I knew it had to be a safety hazard for anyone walking around the area and school was about to let out. I let him borrow one of my saws to finish the cut, he free climbed up the large Pine with no gear on, dropped the top on the chain link fence then fell out of the tree on his way down. He had one more tree to do there and I volunteered to do it for him because I was afraid he was going to kill himself. Plus I was a lot younger and more naive. I even cut the logs up enough for him to be able to carry them. I won't go all in to how the guy screwed me after that but suffice to say that he proceeded to go around the neighborhood telling people that he worked for me and claimed to be insured through me. He also cost me a job that was around $3K...
That's the last time I helped anyone out.