specifics in Spear fighting combat

[garrelt]

If you refer to the large bronze pointed butt spike, the i see what you mean.
Is this also used for putting the spear ferm in the ground in a defencive stand, to make a strong spear/shield wall?

We use light spears (javalins) for single handed spear fights.
So the difference in opinion and expieriance could be laying in the fact that we use a different kind of spear.