I'll explicitly spell out the other assumptions of the scenario since you chose to miss them. If you've cornered someone in an alleyway, you have overpowered t

I'll explicitly spell out the other assumptions of the scenario since you chose to miss them. If you've cornered someone in an alleyway, you have overpowered them, there are no police or bystanders to physically interfere, and "the law" isn't going to manifest as Captain America and beat you like a mook in some comic strip. You would get away with what society calls a crime. Nothing is stopping you from robbing that person. Do you have the authority to?