Stop the killing & then stop the dying.Yes and me the least. But I do have experience rescuing injured folks, and time is of the essence. So I was surprised the IC stood down while kids were still bleeding, a point made by the NTOA guy.
Stopping the killing has to happen before you can hope to stop the dying (treating wounded).
Rescuing injured persons who are still being shot, or may about to be shot, is a different thing than rescuing a stranded hiker, a swimmer stuck on a cliff face, etc (or whatever your experience may be).
We all want to save children. The trick is to do it without making the situation worse. Mistakes are costly. Seconds - and for damned sure minutes - can change everything. The buck stops on the shoulders of the person making the hard decisions, for good or ill. I suspect that this incident is going to end up mostly in the 'for ill' column.
Let's keep remembering that this is the fault of the twisted person who decided to start killing. Any actions that weakened the on-site security are going to earn a big bite of this sandwich, too. The monsters are always watching, and they're ready to act when the first sign of complacency, apathy or simple inattention on the Part of Good People occurs. (Open school door.)