The greatsword skillset immobilises you. As in:
If you use hundred blades, you will be rooted.
Íf you use charge, you WILL charge to X location no matter what, you can’t cancel it. you are out of character control there.
If you use whirlind, you will whirlind to X location no matter what, you can’t control your character movement during this time.
Sword toss gives a small delay, a bump if you will in your movement.
You can cancel whirlwind and charge by changing weapons.