I always try to articulate it as "the point at which you stop caring what a jury might do as compared to what is about to happen."
example: if someone is breaking into your home, you are (hopefully) going to care less about going to jail than being murdered in your bed.
However, someone breaking into your house does not justify deadly force legally. All of the factors Stateline listed must exist. Or you must be able to show that you had reasonable cause to believe they did. A person breaking in is not reasonable cause to believe in itself.