Cops have night vision equipment... I’m guessing having lights- ‘heat’ sources off - will make it easier to find anyone outside. The perps backed their car into the driveway... according to an early report... so they might be hiding near the house for a second mow down...
With the power out, people are going to have a quick trigger finger when they hear a noise or see someone they don’t know. If it is a deliberate power outage, that is a questionable move.