I'm pretty sure I perma-banned them.
They were just about impossible to kill, I think their health was respawning, and in some instances, generating more health to people who were shooting them. To add insult to injury, they were only like 8 and 10 years old, literally. Looked like maybe someone had set them up with hacked acounts so they could go around and romp through servers.
I'll be sure to get steam ID's next time, it was probably around.... oh, 6am or so.