To save my life or the life of another...
Or if he is wearing a striped tie with a striped shirt. ..
In the state of Washington one can legally shoot someone to stop a felony against you, or anyone else. A shop-owner shot an 18-year old that had just broken into his shop at night and was escaping with a handful of leather belts and buckles. Shot in the back from 100 feet and killed.
Legal shoot.
Now - not saying that is what I would do, but the store owner was found not guilty. As was a more recent guy in Spokane after killing the guy that stole his truck as the thief was driving away in it. (The owner thought he saw a gun, shot the guy in the back of the head from his driveway as the thief drove down the street).
Another instance where the stranger did not respond to the man of the house (out in the garage) and walked towards the house. The owner kept telling him to stop but he didn’t. When the stranger reached for the front door (wife and child inside), the owner shot him in the back and killed him. Perhaps more obvious that was a legal shoot, but I suppose in some states perhaps not.
Several years ago with home break-ins on the rise, along with a rise in the intruders being shot and/or killed, one of the sheriffs quipped something like “It is open-season on intruders in Washington state”.