Dave, I'm with you entirely on H&S, it's origins and definition.
Although I mentioned it (under the 'My Thoughts' leader) I'd like to add however of all the saws I own, hand, electric or other powered, it's the chainsaw I take the most care over. They command the utmost respect as they take absolutely no prisoners, being so heavy but are easily swung about, without any sort of fitted safety guard.
I've watched chain-saw carvers many times and have total admiration for their ability to use such an awkward tool with the delicacy that they achieve.
I’m quite sure that Lissi is also more than comfortable with using her saw the way she does, but for myself, with a healthy respect of the things, watching her use it that way does make me wince.