Scary incident with dash computer, what happened?

So earlier, i borrowed my friend's newer outback (i think it's a 2018), ran a few errands, came back and turned down the side street adjacent to my street and into an alley to come back around so that i can park on the other side of my street. As I was pulling into the alley, i had my phone connected to the car via Bluetooth and plugged in to charge like i had the entire time i had been out driving. All of a sudden the dash computer screen glitches completely the fuck out, like the screen became super distorted and then an extremely loud sound screeching/distortion/hellish noise started coming from the speakers. I panicked and quickly unplugged my phone and tried to press the volume buttom to turn the sound off but it wouldn't stop. This lasted for maybe 5-10 seconds. I got worried the power line i was under was somehow electrocuting the car and damaging the electronics? I didn't see or hear any flash but still. I started backing up and by then the glitching and abrasive noise stopped, the rear camera came on and i got out of there and came back around and parked. Turned the car off and got out, then i noticed a horrible fried electrical smell and sure enough it was coming from under the hood. I opened it and saw nothing damaged or smoking but can still smell the burnt smell whenever the car is running. Can anyone explain what happened and what is wrong with the car? Was it somehow caused just by having my phone on the Bluetooth and plugged in to charge??