Answer:
Tell has to decide whether to kill Gessler for forcing him to shoot the apple from his son's head.
Step-by-step explanation:
The enmity between Gessler and Tell intensifies the moment Gesssler asks Tell to hit the apple in his son's head with an arrow. This is the main conflict between them, which affects the entire play, mainly, because Tell fears that he will kill his own son when trying to hit the apple. In this one after hitting the apple, Tell says that if he had killed his son, he would hit an arrow in Gessler's heart, causing Gessler to order Tell's arrest, which moves the entire plot of the theater piece.