Hmm almost happened to me on my last ride, I was booting down a trail and had I cut it a little wide, i woulda been shish kebab, a tree was bent over, kinda like you see in the movies where they make huge spears hold them at an angle for cavlary to run into....
I slowed down and went around, a few minutes later on my way back, I stopped and moved it, well bent it and hooked it securely on another tree... so worst case would be a glacing blow...
Thar be a reason why I wear a jacekt with a heavy heavy canvas outter, adds a slight layer of protection over a regular jacket..