Depends but I would prob go up to someone else and ask if they see what I see.
If no one is there and I feel safe, then talk to the person.
Hopefully also…
Call 911 (can happen before or after the above, depending on the circumstances)
Do people have the hatzalah numbers saved on their phones? It is only for a very Jewish area right? I know one local-ish city that had them. Besides there, I think it’s just 911.
Is the hatzalah trained and accoutable to govt oversight as 911 Emergency responders?
What if you call hatzalah and it gets dangerous? The person starts behaving aggressively.
Does the hatzalah have authority to restrain or retain someone against his or her will?