Fire Axe requires you to be pretty dead on with every swing. You miss or misalign the edge coming down and it bounces off their skull. They feel nothing and now you’ve got to lift up that axe for another swing. You’ll tire yourself out pretty quickly but if the edge lasts long enough I suppose it could be used to make spears as well. Spears, even just makeshift ones from sticks, are light and if you miss it’s almost effortless to get another go at it.