I respect Bioware's desire to shake things up and catch the player off-guard by suddenly introducing fresh new enemies into an ongoing battle, but DA2's almost comical over-reliance on trash mobs quickly devolves into an "expect the unexpected" type of situation. The silliest aspect is of course that it's often very easy to ensure that most reinforcements are not triggered at all during the fight (by simply exiting the particular room or area in which the encounter started).
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