I would actually argue against that given what I know about historic fighting techniques. Polearms are actually fairly versatile. You can simply hold the weapon closer to the head and use it like a shorter weapon, just with the rest of the haft behind you. For instance, with a spear, you can hold it near the point and use it almost like a dagger. With a pollaxe, Ssarak could use it in a similar style as a one-handed axe, as long as his allies don't crowd too close behind him. The haft really doesn't add much weight at all, compared to the head. I wish I could show you what I mean, but words will have to suffice.