Lindsay is a sprinter on the school's track team. if she is confronted by a man with a cast on his leg who is threatening her with a knife and she kills her assailant during a brief skirmish, claiming self-defense would most likely be a successful defense if

I believe the answer is: If she is confronted in her home.
The fact that the attack occurred in her home indicated that the perpetrator willingly come to her house in order to attack her otherwise the perpetrator wouldn't be in her house in the first place. It would also be a lot helpful if lindsay has a home camera that recorded the fact that the man came to her house willingly.