That would be an armed robbery. A strong arm robbery is trying to take property by intimidation or force, even if you don't have a gun. You can catch a strong armed robbery charge for threatening to beat someone up if they don't give you their wallet, while producing no weapon.
This dude us catching a felony for this, based on the words he was saying. If he wouldn't have mentioned anything about the filling of "the bag", he would have gotten a misdemeanor vandalism and disorderly charge. What'll take his charges from misdemeanor to felony level are his own words ...