Get a rifle to shoot him.
Lawnmowers are so bloody annoying and driving one for run is the supreme stupidity. Get a car.
Something in a 20 to 30 horsepower range would do. But new ones in that range are what everyone is buying right now and pushing the prices up, so why not try and find him a used one.
I would swap places with him ,I would be the one who had the accident instead.
By him another 10 acres to boot
tractor is a lil overkill for only 4 acres, but if he's a farmer at heart depending on where you're located, might not be too expensive to buy up the land