I can believe in a homegrown HYDRA
I don't know if the Red Skull with ever return. But I can believe in a movie where a homegrown HYDRA, or even a militia could become the threat.
Who knows? It's possible Senator Stern could be duped into helping them march into Washington.
The swordsmanship's first achievement is the unity of man and sword. Once this unity is attained even a blade of grass can be a weapon.
The second achievement is when the sword exists in one's heart. When absent from one's hand one can strike an enemy at paces
even with bare hands.
Swordsmanship's ultimate achievement is the absence of the sword in both hand and heart. The swordsman is at peace with the rest of the world. He vows not to kill.