ok, since you're a NU follower (and ofc a decent player) ill tell ya.
equip short dark handle spear (550 coins to buy). attack with it while walking forward, then immediately follow with a 180 degree turn and walk backwards at the same time.
Oof. I don't mobile, but i'm expecting that it would be extremely difficult for the 180 degree poost. but i think you can still perform the simple poost without trouble.
the simple poost is just to switch to bow right after attacking with the spear so that the backwards charge is canceled while the forward charge before the backward charge is put in action.