I was six years old. I caught it while fishing from a boat in the Kenai River. I hooked it, then my Dad had to fight the fish with me because I wouldn't give him the pole. It's a wonder we ever landed it. This is an excited plea to please get your lines the heck out of the way.
Most people respond because nobody wants to be the cause of the one that got away.
This is also true for drifting the river in a boat, but instead of a yell another person on the boat holds the dipnet way up. This warns other nearby boats that a fisherman has a fish on the line and needs room. When the fish count of the reds going up the river exceeds the necessary numbers needed to assure a healthy return of reds, subsistance fishing may be opened to residents. With large altered, long handled dip nets the subsistance fisherpeople wade into the river and dip out reds. This is exciting to watch and even more exciting to do when the reds are running.