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afaik, there is no possibility to check who a buff on a group member "belongs to".
hmm but one thing we know about HoTs is, how long the endure. maybe it is possible to assume that the HoT is not removed by some enemy's spell, and display it locally - based on the point of time it was casted. when the effect fades (the HoT is over - we know how long it endures!), removed it from display... this could be kind of a workaround that wouldn't require querying the target's buffs. dunno if it is possible.
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