Bath Salts Gone Bad

My family and I once lived next door to this young, single guy and I could often hear his video games through our shared wall. One day it was particularly loud but I ignored it until a few hours later, he came to my door fully dressed but dripping wet, wringing his hands, screaming and begging me to call 911 as he swatted furiously at his skin! He continued to flail around and scream as my kids stared, terrified, from behind me. I called the paramedics and waited with him until they arrived. Later on, he said he didn't remember much of what happened and I asked if he wanted me to fill in the gaps but he was too embarrassed to talk to me about it.