How do locked encounters work?
When a player or group performs an aggressive action against an opponent, the encounter is instantly locked. This means that no other players or groups may interfere with the encounter. The locking mechanism is automatic, so players will not have to actively lock the encounter themselves. Once locked combat begins, any movement buffs that the group may be using will automatically drop. If the player or group decides the encounter is not winnable, the encounter may be unlocked with a press of the yell key. At this point other players will be able to attack the opponent. Once unlocked, however, the loot and experience provided by the mob are negated.