Codeine's ID: 41339.
Oxycotton's ID: 151463.They both have BLHack and were working together when they joined.
I'm not entirely sure of BLHack's capabilities, but both of them were:
a) Randomly choosing to be invisible.
b) Floating in mid air.
c) One of them attempted to crash the server - proof enough.
I'll try and get the IPs as soon as possible from IsjiX's Freebuild (where it occurred).