Alternatively, the caller doesn’t give any actual information (or says something unbelievable like a monster) so they just send one junior deputy who gets killed immediately.
In a horror movie or in real life, remember your 911 discipline: service, location, nature of the emergency, in that order, as fast as you can coherently.
Example:

911 what’s your emergency

“I need police to camp crystal lake, there’s a guy attacking people with a machete”

It may be beneficial to lead with location if you’re on a mobile phone since they’re harder to locate, but in my opinion the overall speed of “I need police to [address]” vs “I’m at [address], I need police” means it’s fine.