When faced with an attacker, sometimes the most obvious solution is to just run away. But no, you insist on analyzing the physics of the situation, calculating the trajectory of the incoming punch, and determining the optimal angle of escape. Meanwhile, the attacker is getting closer and closer, and you're still trying to decide between "flee" and "fight."
As a result, you've managed to create a complex flowchart in your head, complete with decision trees and probability assessments. The attacker, confused by your indecision, starts to question their own life choices, but ultimately decides to just tackle you to the ground.