I think it's yet another example of the importance of clear communication. Two people playing at cross purposes and not being clear about motives can have unfortunate (and usually unintended) consequences. I can't help help wondering if that might possibly have happened here. If not, then it was clearly a betrayal of trust.
As to limits. Hard limits should be clearly expressed and outlined plainly so there is no misunderstanding. No Domme should ever try to push a sub in this area unless there has been a change clearly expressed pre session. "I don't like", I'm not into" and "I have no interest in" should all be taken onboard by the Domme.
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