We now know that Boelter retreated into the house. The responders called for a SWAT team, and that takes time. That gave Boelter plenty of time to get a head start through the back door.
When the first cops to arrive returned fire, he retreated into the house and escaped through the rear door. I assume that the police waited for a SWAT team to arrive, which gave the guy to put himself a good distance away before help got there.
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