Simply because taking cover to escape possible police gunfire coming in your direction isn’t required by law doesn’t mean it’s not a good idea.
I didn’t say that it was or was not a good idea. There are many situations in which that might be exactly what I’d do. On the other hand, “the police are on the way” can mean about the same thing as “the check is in the mail.”
Within a few weeks there will be a clearer picture of what this incident was really all about.