[RC-Monster Mike]

Sounds to me like a misunderstanding. I have dealt with T-Bro off and on for years - he has always been straightforward, honest and very respectful in emails as well as on the phone. Based on your side of the story, I don't see how you are at fault or responsible for anything beyond what you have done. It is certainly possible that Travis over-discharged the pack and caused the issue described, but without his side of the story, I personally will reserve judgement.
My thoughts are that more communication is needed between you, as I see both parties as amicable based on my experience. :)