This is crap. The guy in the video was taunting her to show the knives, he’d been having fun harassing the other girl. That’s why they were so mad. “Bulgarian” could mean he lived there for a couple of years. Do you have the name of the “Victims”?
Check the sources yourself. The guy wasn’t taunting her, he wanted her to show the knife on camera.
The Bulgarian couple (man and woman) were verified. And no, Bulgaria generally exports people, it’s too poor to attract immigrants