If the player commits a crime during DLC1WE08, such as transforming into a vampire lord, they will receive a bounty in The Rift regardless of whether the world encounter spawns in that hold or not. This happens because the NPC templates used (DLC1LvlDawnguardMelee1H, DLC1LvlDawnguardMissile) are part of the CrimeFactionRift faction.