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Broward Sheriff's Office had trained him to seek cover and assess the
situation in the event of outdoor gunfire, his lawyer said.When police arrived, he told them he thought the gunman was outside -
a belief backed up by "radio transmissions [which] indicated that
there was a gunshot victim in the area of the football field," Mr
Peterson said.http://www.bbc.co.uk/news/world-us-canada-43202800
He really does seem as though the police officer thought the gun shots/shooter was outside. So he had no reason to go into the building.
^^ This. I assume the chap hasn’t been allowed to give his story in public until the politicians have had a chance to throw him under the bus first?