We have predatory birds so I stay very close (practically straddling) the smaller snakes if they are on the lawn. OTOH I don't see an adult retic getting carried off by a hawk or owl.
Also bear in mind that if the snake is outside and you haven't touched it for a few minutes, it may forget that you're around. I take a hook out and if the snake has been in the grass exploring for a while, I touch it with the hook first as an unexpected touch can get treated as an attack, and they'll nip.