He's not lucky.
The police don't come, drawn to the fighting like vigilant eyes should – but he knows, rationally, the police force is spread too thin and there are too many within it who'd rather fill their stomachs and wallets instead of do their duty to keep the peace.
A hero doesn't come, guns blazing and powered up fists smashing the enemies away with a single super-critical hit. A victim doesn't unlock hidden magical powers because he's triggered the flag.
Reality is imperfect like that. He himself is the prime example: despite the folly he'd still leapt into the fray and he can only block one hit in four, one kick in four –
There are four assailants, after all, and he's only been taught to fight fair, one on one.