A speared fish does´nt grab till got tired and less with a barely hit shot, here in cuba the amberjacks revive after allmost dead seem like those Kingfish, Serviola or LemonFish
Containing that first tail was a cluster....get hold of the spear first with both hands either side of the fish on the spear. Use your legs to control the tail. From here you can slide a hand into the gills.
I love spearfishing Soo much just cannot afford a good mask,hope you can give me.even a used one. I will be Soo much thankfull. Take care always in diving. God bless