Also witnessed a buddy have his throttle freeze open on a whooped out trail. By the time he realized what was going on, he got bucked off hard enough it exploded a plastic bottle of Mountain Dew in his pack and when the sled endoed, luckily the throttle unstuck. Could have ended up hitting someone else.
The tether won't help when its wrapped around your handlebars.
I had the throttle freeeze up on my mod T-cat a number of years ago (really deep snow and some got down into the cable at the throttle block), came around a corner to a straight and opened it up to stretch her legs, when I went to back out of it, she was stuck wide open. Hit the kill button and very lucky that we were alone on a forestry road and I had lots of road to run out left before the next corner. I was doing around 75-80 mph. Its amazing the little things that will make a throttle stick, even just a few frays on the cable or a little bit of snow or ice. The tether won't help when its wrapped around your handlebars.
Scary stuff!
A few years ago, I saw a accessory 'quick connect' for a helmet strap. Does anyone know where I could source one for him? I figure at least if I buy him one it might raise awareness and offer up a simple solution