The whole murder and torture women chic thing they had going with the poster is disturbing too, in addition to something about what ninja turtles may have symbolized at the time, but I don't recall the details correctly. Maybe the whole imagery for the poster and the themes, the little "True Detective" style decorations, bunched up twigs hung as ornaments, often enough, a point of focus for one of the official cameras, prominently bobbing up and down in the videos of the bash, may have all been some inside joke among BM's circle? Who the cares. It's violent, misogynistic, dumb stuff. Who but morons there that night would take it seriously?