I think you'll find, including military, that when firearms are in use they are cleared and emptied after the situation is resolved and is closed. Resolved isn't just having someone handcuffed, it's when they've left the scene.
A situation of having Police unload and show clear to a colleague while people/perps are still being engaged with would create a very unsafe environment, for everyone, especially the public. It would be difficult to protect the public - after all, that's what they're there for with loaded firearms - if the situation escalated and Mr HandCuffed Fucktard or an unseen associate decided to cause more trouble.
There's plenty of body cam videos on YT showing how quickly a benign, quiet scene can escalate to the use of firearms very, very quickly.
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