I fail to see that the "being teamed" was ever meant differently from including healers like every out of team attackers (in a way, the healer of an attacker is an attacker no less than that one doing the actual strikes). So I am sure that healers, as well as (other) co-attackers, were never excluded from being aggroed.
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Daomei die Streunerin - religionsneutral, zivilisationsneutral, gildenneutral