Going in via an eye on an angle rearwards and upwards you will destroy their brain which is long in a fish, it is small but spread out longitudinally and will break the spine at the base of the skull. With vision gone their jaws will reflexively work, but you keep your hand away from the front end. The results are not pretty, but you chop their heads off and pull the guts out.
Should I wear a cup for spearfishing ?. .
Going in via an eye on an angle rearwards and upwards you will destroy their brain which is long in a fish, it is small but spread out longitudinally and will break the spine at the base of the skull. With vision gone their jaws will reflexively work, but you keep your hand away from the front end. The results are not pretty, but you chop their heads off and pull the guts out.