It’s like the bystander effect but for code, lol.

Just pick someone and give them the task.

One thing I've learned from responding to emergencies is that you can't just yell "help" at a crowd, you have to pick out someone specific and say "You, dial 911."

We had someone collapse on campus and have a seizure. An entire group of people stood around this person as they wet themselves, nobody doing anything but watching. I picked out specific people from the group to help, told them what to do, and told everyone else to back away. There was even some guy who got pissed at me for telling him to leave the area, but he's exactly the kind of person you want out of the way.

Lesson here, be specific, be aggressive, and take charge when it's needed, because it's very unlikely that a bystander will do anything but watch.