The duck is probably fine.

We were fishing off of the Channel Islands off the coast of Venture, CA once fine day. Suddenly my rod bent near double, and about 100' away a seal pops up out of the kelp. I give a hard pull and the seal goes down- uh -oh. Worked on the thing for what seemed like and eterety but finally managed to get the seal near the boat and broke him off.

Last year on the Bitterroot, my son in law hooked a mink with a fly. I was ready to throw him (the son-in-law not the mink) out of the boat if he started dragging the mink towards us. Luckily he got off- climbed up on a rock and glared at us. Man was he pissed.

jh