That's too bad...
The one time I was truly fearful for my safety while fishing was in the Capilano canyon. It was early in BC fishing career (when my enthusiasm and good sense were not in equal measure) and I was fishing for early coho in the spring. I clambered down the canyon walls to fish the Dogleg Pool and climbed back up the canyon at a different location. Mistake #1
Half way back up I became stuck. I had tucked my fishing rod in the back of my vest, so I had both hands free to climb, and it was getting caught in foliage and preventing upward progress. And the rocks I was clinging to were mossy and slick. So there I was: not feeling I could safely go down, unable to go up, and having a tentative purchase on mossy rocks and roots. And then my limbs started shaking, and fear set in. After a bit of maneuvering I was able to go sideways, free the rod, and continue up.
Thereafter all my fishing in the canyon was on established trails!