I'm not into BDSM, but I know several performers that have worked with Kink numerous times, and none have every complained about them (even though I would never do the stuff they did). In fact, they say they were treated great and were paid very well.
My friend Annie Cruz has done probably a dozen extreme scenes for Kink and will be shooting with them again later this week.
As Socks stated, Kink has too much to lose, to risk everything over one model. I'm sure they have everything on film to defend themselves.
Besides, I could be wrong, but I don't think they allow blood in their scenes.
Ricky, did you talk at anyone at Kink?
ADG