Unless the snake is dangerous (poisonous), let it be. They keep mice and other critters out of your garden. The only one I have intentionally killed was curled up on my front steps and did not move when I approached and poked at it with a stick; although I have (unintentionally) chopped up a couple in the lawn mower over the years. One dashed away across the driveway while I was tending the tomatoes yesterday.
Wow you are brave
No, just don't want to lose sight of him and then wonder when I'll see him next.
Gosh not something I am used to in my UK garden.
Not used to it either. I went back and counted the snakes I've killed here, nine in twenty years. I still remember where I found each one. (Live beside a pond.)