Isn't it obvious? Cuz you guys always make it seem like it's something special to one shot someone with swords and normaly a one shot means 'much stronger than the oponent' - while this is true by a 1 punch K.O., but not with swords. A grandma could kill you with 1 sword slice, so the grandma one shoted you and is much stronger than you - going by this logic.
A one shot with swords is not special, cuz 99% of all swordfights end in a one shot. Doesn't mean the one who wins is on a different level. So it's pointless to point it out "He OnE sHoTeD hIm".