the origin of Painkiller

hey people, just listening to all my Painkiller material, something struck me. How did Painkiller form? does anyone know? Did Zorn approach Mick at a Napalm show or something? Did Mick know Bill? who knew who & how did they end up getting together? I take it it was Zorn's idea as I've heard him mention how he wanted to create some free improv music that people would slam dance to, as he felt free jazz & grindcore had the same intensity. any one know? thanks Andrew n.p: Painkiller: "Rituals - Live in Japan"