Acually if you listen to 911-3.
At .23 - .30 secs you hear the yellers voice brace for impact from an object.
And hear an object thrown or slammed onto them.
Maybe twice.
911-2 the guy said they where on his porch.
I think this was what changed the situation.
In 911-3
The VERY FIRST THING you hear.
Is the yeller say “I’m waiting”
That is the very first thing. Its almost cut off.
Then is the dispatchers introduction.
I see that Zimmerman gave people a chance to help him.
Nobody came and he was getting his face smashed in with objects.
Seams like a reasonable action to shot.