Prognastat, yes, I do realize I took my chances by crossing over to his yard. Fortunately, he came down and was quite pleased with me helping. If he would have been upset, I would have packed it up and went home. I just asked if he could keep up with it going forward. He agreed and apologized and I really had no problem with that, and was happy to help. It took me another 20 minutes to knock it out after mine was done.
But, then over the next few weeks, it got knee high again, and so I took care of it once more. He got the message, bought a mower and all is good now. In fact, he went from being a guy who would barely return a wave to you, to a nice guy who seems to be more friendly now.
My whole point, wasn't to show that I'm a bad ass. It was really to tell folks, that if you sometimes give people a little hint, it can save you from escalating things to more bureaucratic methods. But, my "man shaming" comment could have been a little harsh (thus Rezdent's confusion). I think he was a little shamed himself, but that honestly was not my intention. I just wanted the grass kept up to reasonable levels!
Cheers.