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One's first impression of that might be to be amused or think it's good or clever that the car stopped some wilding hooligans, and I totally get that. But this is not something we should want. Indeed, it's highly dangerous to extend the police state to a privately-owned and wholly unaccountable rolling surveillance system that can literally lock up people and deliver them to the cops on a whim. And you know damn well that, eventually, it's going to turn out to be racist too. I'd bet my life on it.
Don't use Waymo, folks. If that's the only option, walk to the nearest hotel and find a taxi stand.