The assailant made a big mistake if he attacked the man IN the Post Office. That is a federal offense with heavier penalties than if just on the street (California leftist judges can’t beat a federal indictment. No bail!!!)
Then check the guy’s citizenship/immigration status. Adios pendajo after you serve your sentence with the White Aryan Nation guys in the cells next to you.
Oh, did I mention, all Post Offices have security cameras?
It’s also a federal offense to strike a senior..federal gray bar, up to $5k fine....and did I mention a step up in the charging statute