If a character does something that indirectly incapacitates them, what would you do?

@ChrisPerkinsDnD if a character does something that indirectly incapacitates them, what would you do so the player doesnt just sit there?

— Ethan Bohr (@EthanBohr) June 17, 2016

Nothing. https://t.co/ru5CKQwalN

— (((Chris Perkins))) (@ChrisPerkinsDnD) June 17, 2016