An instructor, wow.... just goes to re-enforce it can happen to anyone at anytime.
'There was a youtube vid floating around on here that showed a bunch of ski patrolers out for training when an unexpected tree well incident happened. Guy ended up face first in a well with barely his skis showing above the well..... even the trained pros struggled, panicked a little, and were freaked out about the incident. The rescue wasn't the smoothest either.. scary scary... but those trees are sooooo inviting.
I think we ( I ) need to have some knowledge on what trees to look out for, and even then....... may God be with you!