I'd like to see a ridiculously fast and aggressive thrall boss! Just you, fireteam and this super angry screaming thrall... For once they need to have a boss in this game that does something besides blast a shrapnel launcher.
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Never happen. Bungie will never let you ( and an entire fire team ) go up against just a Boss. There will always be an infinite amount of adds that spawn at regular intervals or when the boss's health falls below a certain level.