Thanks Jon

Well, in my defence, all I can say is that based on my (admittedly limited) spear-throwing experience, I'd agree one normally holds a spear in the middle for jabbing etc. But for extra heft when throwing, you naturally tend to let your hand slide a little towards the head end to deliver that extra bit of 'push' and thus weight and accuracy to the throw. Not sure of the physics, but instinct makes you do that. It does depend on the relative materials and weights of the spearshaft and spearhead of course - a heavy shaft with a negligible weight from the spearhead would let you throw from the centre of the shaft perfectly well. But with a hefty spearhead on a lightweight shaft, if I threw from the middle of the shaft, my thrown spear would take a definite nosedive...
There again, my re-enactment career lasted only a few weeks and took place 25 years ago!
