its pretty clear in the vid that Dark Urge is not aware of their actions until after, they black out and then Gales hand is just there when they come around... for all we know Shadowheart killed him and pinned it on us?

Oathbreaker has to chose to break their oath like any other Pally has the choice to keep theirs... if a wizard casts a charm on you then you wake up next to your dead sister its very bad but not breaking your oath imo