This can also go south so be mindful of the situation. Certain escalations can get those vulnerable people arrested even if the black bloc group is distinct.

A good tactic is to split the group as a diversion, separating the vulnerable from the rest (while not making it obvious - half the black bloc should stay with the vulnerable), and allowing one of the splits to go do cool things. This way, the vulnerable will be blocks or miles away when things go down and won't even see it happen but the cool things can still go down.