When I was studying the bas-de-page miniatures in Bodleian MS.264's Romance of Alexander, I noticed several pages with paired spearmen. They all seem to have two different styles of spear butts, one pointed, and the other forked, with two or three tines. Does anyone have any suggestions why these two styles would be paired? Perhaps it's a storage issue, or to facilitate different grips within a line depending on ranks within the formation?
http://image.ox.ac.uk/images/bodleian/ms.bodl.264/196v.jpg
http://image.ox.ac.uk/images/bodleian/ms.bodl.264/197v.jpg

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MS Bodl. 264, fo.197v

I think the shape of the butts are more likely attributable to some martial purpose. The three spike butt looks like an early form of partisan. I would suggest that it would be quite potent against an opponent who was unarmoured, and perhaps reasonably effective against mail. The twin tines look as though they could be used as to likewise stab, and possibly as function as a means to bind against other polearms. I'm not sure that the pairings have any significance otherwise.

Both versions could be useful both for attack and for stick the butt into the ground in anticipation of cavalry charge.