Run to a phone as quickly as possible and call an ambulance? Unless there was a more imminent threat to my life.
Agree.
One factor is that Dave had a house full of coke, weed, and steroids.
Calling 911 means he's doing 10 or 20 years hard labor. Many criminals choose the 'out route' as opposed to losing their freedom.
More likely, however...

Plano Police Officer Jack D. Forensio, who happened to be the first lawman on the scene, efficiently cleaned up the crime scene and declared the case closed.