Time: 24FEB14 @1500JST
Frequency: 1st time
World name: Tonberry - but this is from a duty finder acquired group
Character name: Nana'astar Deviluke
NPC name:
Monster name: Final boss of Haukke Manor; additional spawning monster Manor Sentry
Class/Level:
Party or solo: party
In-game time:
Area and coordinates: Haukke Manor Hard mode
Steps:
1. Haukke Manor party from duty finder
2. Utilized new markings A, B, and C at positions of additional monster spawning prior to start of final boss fight
3. First add monster Manor Sentry did not die. Boss's hp still went down. Fight ended but with no additional spawned mobs.

screenshot: http://i.imgur.com/eCfuWea.jpg