This dream took place during the day in the city of D, I was outside with maybe my brother GC in a fictional area across the street from Dairy Queen, at some point I needed to urinate, and so I walked to the Dairy Queen.
The inside of the Dairy Queen did not look like a Dairy Queen at all, the bathroom had bathroom stalls scattered around, and males and females were using the same bathroom.
I urinated and when I turned around my former male classmate KW was standing behind me inside my bathroom stall, somehow how he had sneaked in behind me without me noticing, and he was standing there looking at me without saying anything; and it was pretty creepy, he looked mentally unstable, and I greeted him as I quickly left to wash my hands.
Fortunately our former female classmate LB entered the bathroom, and KW walked over to her instead.
While I was washing my hands I saw my female coworker FP enter the bathroom, and I saw KW pull out what looked like a syringe that he stabbed into LB’s neck which put her to sleep it seemed.
KW then used a device, maybe a watch-like device to trap LB’s consciousness and / or her entire body inside of it, I was hiding in bathroom stall at this point, and his device was possibly like a combination of the Grain from Black Mirror and the Muon Trap / Ghost Trap from Ghostbusters.
KW had already trapped other people inside his device, I somehow learned that Itsreal85 was trapped by one of his own cousins inside the device or another device and Itsreal85 was angry about this, I was not sure if KP got trapped inside the device too or not, I just remember trying to sneak out of the bathroom while KW was distracted, but I woke up.