You take aim at the fish. It's about 6 meters away from you, but totally obtainable with a good enough throw. You raise your arm...take aim aaaanddd THROW!

The moment the spear hits the water however the fish swims away, scared from the impact. You couldn't tell wether your aim was off or that this fish had super reflexes, all you knew was that you were PISSED! But your spear! It was plunging into the deep water below!