When anything that can’t travel downstream binds around your body, it’s called entanglement. Ankle leashes hooked on rocks or ropes are examples.
When you’re caught between anything upstream and a static object downstream, it’s called pinning. Your board anchoring you to a rock or bridge piling upstream is an example.
Entrapment of the Leg and Foot
Entrapment occurs when a body component becomes entangled in the river’s rocks or other debris.
Everything in the river that permits water to pass across but not you is a …