The sources state that Kong was upset that Sky a non TNA wrestler was dressing in the same locker room as the Knockouts and threw her bag into the hallway. From there the accounts vary from a Kong atempting to get to Sky to Kong grabbing Sky by the neck. Again these are second hand accounts that no one is taking ownership of at this time. At the end of the day this could also just be random speculation.
Kong does have a history of rumored backstage confrontations, previously allegedly assaulting Bubba The Love Sponge backstage at a TNA event.