Simple, we were on WaW playing 16p Sidi Rezegh and messing around fightin' Italians, etc. when our SL noticed there was a second SL2. this triggered a wave of responses, which lead to my taking a screenshot.
The 2 supposed SLs were:
ProffessorAnthrax (real SL)
TimeAssassinMachine (strange SL, who didn't show up in our squad except in scoreboard)
Screenie below.