20b is better than 28c most of the time, in terms of avoiding glances.
He is technically right though Phew, in that the Estoc didn't really have a cutting edge, it was like a bar mace tapered to a very sharp and sturdy point, meant to stab through chain and plate (or at least in crevices).
So technically its swing dmg should be blunt...
Wikipedia says this:
The estoc was a variation of the longsword designed for fighting against mail or plate armour.[2] It was long, straight and stiff with no cutting edge, just a point...
Blade cross-sections can be triangular, square, rhomboid or flat hexagonal.[1] This geometry left hardly any cutting capability as a sharpened edge could simply not be ground, but allowed the weapon to become lengthy, stiff, and very acutely pointed.[4]
But I agree....blunt on this might be dangerous from a balance perspective. I would give it 18-20 blunt and no knockdown.