THAT was probably 'kickback' and scares the hell outta me.one was an accountant who was trimming some overhead branches for a tree stand and some how the saw came back over his head and snagged his neck and almost beheaded him.
I trim overhead branches, but NOT with a gas powered saw. I use an electric pole saw like this:
http://www.remingtonchainsaw.com/106821.html
It's much lighter than a gas powered saw, I'm standing on the ground (ok, sometimes in the bed of my pickup), and I'm away from and to the side of the saw and branch. I use a 1250W inverter which makes around 10 amps, plenty for most power tools.