Well, I am not saying the fish died, but it was a little unnecessary under the circumstance. I am not squeamish. either, about killing a trout, but if you are going to release the fish, I think you should give the best chance of survival consistent with your purpose.
I often admire fish out of water, get photos, show them to persons nearby (from a distance usually) and have dropped fish accidentally, not to mention many unfortunate hookings, but during that clip, I began to feel uncomfortable with the length of time out of water. The fish had stopped gasping and when placed in the water, it lay motionless through at least two "tugs" before slowly sulking off.