How did Theseus conquer sinis?

Theseus conquered Sinis, also known as the Pine Bender, by using the same method that Sinis used to kill his victims. Sinis would bend pine trees and then tie his victims to them, causing the trees to fling the victims to their death. Theseus outsmarted Sinis by turning the tables on him and using his own method against him, ultimately defeating Sinis and freeing the land from his tyranny.