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What Set off Sentry?

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So this morning about 730am the Model 3 starts alarming. Nobody around the car. I went out and looked at the Sentry footage and a school bus stopped on the road in front of my driveway, probably 50 feet from the car at least. The stop lights are on, the kids across the road leave the house and get into the bus. As the bus starts to pull away and the stop arm, still flashing, starts to go back against the bus the Sentry alarm triggered. Any idea why?

I thought the actual alarm didn't go off unless something significant occurs like the doors open, a window is broken, etc. Why would flashing lights over 50 feet away and nobody near the car set off the alarm?