I don’t think the situation allowed for that. There was already aggression against the police there (sadly we don’t know what the kid did do, to get arrested). The police was already trying to get out of the scene to avoid confronting the people who tried to stop the police from doing so. Getting someones ID is more than just asking/receiving an answer, it’s a process that takes several minutes even in quiet situations like when the police is called to a minor traffic accident etc.