Judging by what happen on Friday, you can possibly guess they were partying in Austin with his twitch friends and she probably didn't want to leave to get online. So he probably dragged her out and drove her back to her house. Most likely she was pissed and he probably got annoyed. He said he was driving while she was online, so most likely he was driving back to Austin and going to sleep.
Lights was one of her best streams although, I don't think I seen a copy of those videos where the audio wasn't screwed up in years.
Come on guys you know those ranks never mattered to her