Meursault
Organic Mechanic
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Have you been on a mass shooting scene before? Resources are grouped and deployed as they arrive. The overabundance of resources doesn't occur until midway to the end.
The casualty collection model for mass shootings seems based on a fairly traditional school/workplace shooting; as a hallway (seriously, that's how the presenter was breaking the scene down) is secured, a couple officers already in the area start moving victims back to the casualty collection point. Presumably, the first few officers coming in go try to make contact and then as more come in, they're assigned to secure and evacuate areas, expanding into the building one hallway at a time. Any aspects of the LE response more complex than this got filed under "tactical stuff I don't need to worry about", so I can't really defend it any better.
This probably slows down LE in securing the scene, but it greatly speeds the movement of victims and creates a clearly-defined warm zone. It's faster, more flexible, and less confusing than using separate teams that need to move from a staging area and be directed to patients.