Are you all sitting down? Not just sipping your coffee? Hope so, because you are about to see an extreme rarity. I'm going to agree with lilysdad.
So, in conclusion.. I always knock and announce , when the situation allows and warrants it. I will not knock and announce my presence in the middle of an assault, no matter how seemingly minor. Just remember, the most brutal assault often begins with one punch.
For once, I am in agreement with lilysdad on something. Particularly that last sentence.
For those of you who think in terms like "it was just a punch in the nose", such actions can kill somebody and sometimes do. What happened was a battery. From the looks of things, it would appear that there was a pretty good chance that more violence was going on inside. When things like that are happening, there's really no time for a cop to consult almanacs, encyclopedias, or his medium to determine what to do. Action is needed.
Apparently Utah case law supports the idea that police should wait until the nose punch has already turned into a dying victim to consider the circumstances to be exigent. I certainly do not agree with that thinking and hope that Florida's case law doesn't support it.
The root cause of this problem is that Utah appears to be sufficiently populated with idiots that this state of affairs, namely that a cop should be ensnared in a web of rules and regulations when somebody's life is at risk, has come to exist. That is the problem.
Utah should fix this problem by joining the modern world. The prosecutor was clearly attempting to force that issue. Good for him/her.
Although Antipitas has the SCOTUS invalidating state precedent right, and that is a bad thing, SCOTUS nor the prosecutor did not cause this. Utah did.
When the state of affairs becomes sufficiently untwisted so that entering my house to protect me from the anticipated punched nose is considered by law more exigent than the entering my house to protect me or anyone from a joint in the ashtray, then I'll start applying logic a little more rigorously.
Until then, I support what the police did and am happy with the outcome.
A twisted system requires twisted thinking to work.