Using a stump grinder

[Deluks]

Defintaly don't bank on it though, if it were me I'd be easing off when anyone walks past, just pressure washing the drive people would seemingly happily walk through a haze of dirty water mist.

Indeed. I've seen people on their phones with headphones in just walk through a coned off and signed footpath.
Best practice is to have a spotter keeping an eye out for the dopey effwits.
.

 

[shagster]

For one that small I'd just sabre saw at an angle. I have a supply of cheap, long blades that I don't mind sticking into earth for stuff like this, they quickly get messed up but are cheaper than stump grinder hire.