Where there's smoke

Left to go get John around 2:40 am. Smelled like smoke outside. Like a campfire or a fireplace. But who the heck is making s'mores at 3am or heating the house when it's 80° out?

John and I got back here about 3:15 am. He smelled it. So I called 911. After reporting it,  I came in to pee quick. Went back out,  saw the firetruck going to the complex behind mine. Then turn around and drive slowly away.

And now there's a breeze. So I don't smell the smoke out there now.

Can't help but wonder whatever happened.