Curious to hear this as well I like to learn the specifics on the rulesets. AFAIK harmony actually is oddly enough considered a positive effect instead of a negative effect on NPCs which is the mechanism it uses for being "unresistable" and with no level limit, so I would think it wouldn't be considered engaged but I'm not familiar with what the ring thing is so maybe there's something I'm missing there.
If it were just some mob out in the wild that someone was trying to FTE and they just put Harmony on it, I wouldn't have thought that was engaged because there's no way to demonstrate two other players that it's been hit by anything in the first place if nothing else the mob wouldn't be attacking you.
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