Chris: Your patronising "I wish him well and hope he reflects . . . " comment thinly disguises a guess-what-I-witnessed sensationalism which tells us more about you than you realise.
IF you were really concerned then you would have (that's "of" to you) exercised discretion and allowed the incident to pass.
You didn't need to name the festival. You could have been discreet and general. I suspect you needed to nudge and wink in the direction of the identity of the "certain" melodeon player to feed your schadenfreude.
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sj