The machine war begins with lawnmowers?

Not exactly terminator material, but it seems that a robotic lawnmower in Denmark has killed its operator. The lawnmower is a commercial lawnmower meant to replace the large riding lawnmowers used by lawn care professionals. I can't say I've ever heard of it before, but it looks pretty cool. The lawnmower is controlled by a remote, much like the radio controlled race cars you can buy in most toy stores.
In this case, it seems that the mower fell down a hill onto it's operator. Killing the operator instantly with a blow to the head from a blade. No word yet on whether the mower was charged with a crime or not. Lets just hope that this isn't the beginning of a robot revolt. LOL

All jokes aside, The guy did die. Not exactly a nice or funny thing. My question is why was the guy sitting directly under the mower on the hill? Seems like if the hill was that steep, then he should have been farther off to the side.

Check out the story at Ekstra Bladet Man from Ballerup killed by a lawn mower Sorry for the auto translation, but I couldn't find an English news story.
Via Engadget: Robot lawnmower kills Danish man