Ok. I'm looking at the call log again. It's not clear, but I think the officers may have arrived independently, soon, but over staggered times. Sheriff's deputies in my area would each have their own vehicle, not team up, especially on a Sunday night.
At 11:56, officers #329, #325, and #317 were dispatched to the scene, with very limited info: hang up call, with yelling. #329 appears to arrive first, or at least reports to dispatch first. I imagine he/she pulls in, everything is quite, no movements, no noise or voices.
1:03, officer #329 reports to dispatch: possible suicide.
1:04, #329 requests EMT
Next:
1:05, officer #325 reports one male down, multiple rounds spent.
1:06, officer #317 advises door "has been" kicked in.
So now there are 3 officers/deputies. This could mean the 1st officer waited 1-3 minutes for backup or supervisor before entering the home. I don't know, just a plausible scenario - often SOP for LE to advise a superior, wait for backup, etc. I suspect the first officers also moved around the outside of the home and vehicles with flashlights to assess any risk factors, etc. during this time.
Next:
1:08, #317 advises they are going to clear the house.
1:11, #317 advises two subjects down.
There's a lot more info on the log, but keep in mind the words/notes are the dispatchers interpretations of info being relayed, quickly, and in short sound-bites. Each responder will have made complete records and reports which we will likely never see before a trial.
Link:
http://media.graytvinc.com/documents/barron+county+call+log.pdf