What would you have done in Leon's shoes ?
Imagine Sayaka just tried to kill you and locked herself in... I believe our baseball player's actions are totally justifiable, I would probably have done the same though probably differently.
There can be lots of reason but I can only talk if I was myself in Leon's shoes: Emotional first: -I think at that point your brain doesn't think clearly, because you are in "eliminate the existential threat" mode -You also have the sadistic urge to make someone who almost killed you suffer
Logically: -Sayaka is a well liked and popular beautiful girl, people will never believe you -I can't fathom ever trusting her or being friends after that, the almost death will always be on my mind -Since it is late and the circumstances, if there is a time to eliminate someone it is this one
Am I crazy ? 😮 What would you have done ?