specifics in Spear fighting combat

[Paullus Scipio]

...another point may be relevant here; namely that a thumb-forward-toward-spearhead grip can be used overhand OR underhand, without having to change grip and facilitates a quick change from one to another - it's disadvantage being that an overarm thrust with this grip is not as strong/powerful as the overhand grip with thumb-toward-butt-spike/sauroter.......obviously, grip would change from one situation to another.
Robert wrote:-

I don't see much difference between the underhand low and the underhand high representations. The spear seems to be held evenly high when compared to the body of the owner.

.....however, as you are a Late Roman, I am sure I have seen the 'high underhand' depicted by you in photos on other threads, even if it is not too clear from Paul's pot images....it is the one where the spear is tucked relatively high under the armpit, elbow out, whereas the low thrust has the arm almost full length, and the stab comes up from below the waist, with a bend of the elbow/forearm in a fairly vertical arc...

"the most dreadful thrust of all" ? D lol: