As noted, the first LE officer(Mortensen) came on scene reportedly due to the subject being involved in a minor TA(traffic accident).
I agree that Mortensen could have made entry(moved further into the house) if the male subject became non-responsive(didn't talk, move or make any noise) but that doesn't automatically mean he harmed himself or posed a serious threat.
Most people under normal conditions can hear or "know/feel" if someone is there.
Doing security work & LE, I've been in events where subjects were hiding or were non-responsive.
Once a illegal(undocumented immigrant) was hiding in a back bedroom under a bed. The two deputies I was working with cleared the apt & we found the male quickly. The female deputy was
not very happy when we found him & I don't blame her one bit.
Clyde