From the online compendium:
Bravo [Multiclass Bravo]
Benefit: You gain training in the Intimidate skill. Once per encounter, as a minor action, you can designate one creature you can see as your prey, gaining +2 to attack rolls and damage rolls against that creature until the end of your next turn. The creature remains your prey until it drops to 0 hit points, until you end the effect as a free action, or until the end of the encounter—whichever comes first.
If the effect only lasts until the end of my next turn, why the distinction that it remains my prey?