A large tech company decided to stop having subteams responsible for particular features or areas of the code for one of their products. The result was developers having to spend inordinate amounts of time researching highly complex spec documents and reference manuals on a daily basis for even the smallest of fixes. It drove moral into the ground and developers started a mass exodus to other teams or tech companies.

After some changes of management for the team, the policy had to be reversed to stem the bleeding. Turns out that developers don't like permanently being in unfamiliar territory.

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.