Tobias is starting to suspect (Mach Seven is starting to suspect, gotta habituate using his superhero name in costume) - Mach Seven is starting to suspect that patrolling for random muggings just doesn't work very well if you don't have powers suited for it.  Easier to find a mugging victim than stumble across a mugging right as it happens.  Zepharthalin can fly around and catch people from the air, sometimes, a peregrine falcon can cover more ground than a human even with super speed and roller blades, but even so it's not terribly often that a search turns up anything.  And Mach Seven isn't yet a big enough name for his mere presence on the street to be much of a deterrent.  There's only so much you can do in the superhero-costume department by scouring thrift stores, too.  He's pretty sure he just looks like a goofy college student too old for roller blades and overly paranoid about wiping out and skinning his knee.

But still - he's an actual bona fide legit superhero.  He doesn't see a lot of action, but he has managed to stop a couple of muggers.  Soon enough, he thinks, people will start to recognize him.  That feels pretty good.