sucks, but i think you're screwed on this. your intentions don't really factor into the law if the guy decides to press charges. ultimately, you took his property and he has you on tape.
the police are obligated to respond to every report, and while a police may scoff at the guy for making a dumb call to the cops, they will still file a report, which the guy can then take to small claims court as evidence against you, which will be pretty damning against anything you may be able to bring, because it'll fall short of a police report.
you got screwed on this, i'd go back to the owner, admit that you took it without thinking about it, and call it good at 1400.
if he insists on extorting 200 from you, let him know that it's going to be his time and his dollar to file with the police, go to the police station to get the report, go to the small claims court to file a claim, filing fee, then find and pay for someone to serve you, then take time out of his day to show up to court, to try to get 200 back for services you've already performed, and have returned his blower, and have text messages showing that he's trying to extort money.
I'm guessing he won't want to go through all that hassle.