Well he'd kind of have to have a 14-15 foot wingspan just to get off the ground, don't you think? I mean, physics and all. So no. But I dislike calling the cops for any reason, so I'm a little biased.
On the ground that guy doesn't sound like he'd be a big deal, even if, say, he were belligerently drunk and threatening fisticuffs. I mean, with those huge wings he'd be pretty bulky and awkward fighting on the ground. The only thing I'd be remotely concerned about is if he were strong enough to pick me up and drop me from really high up. But even then if you saw it coming you could probably just walk inside a store and he wouldn't even be able to get in the door, unless those flappers fold up really small.