How do I know the fire is gone on Heroic Blackhorn Fight

Throughout the fight as the ship takes damage, fires will appear, and the wow gold NPC crew of the ship will pour water over the fire. The mechanic of the fight is to stand in the fire while the NPCs are pouring water onto the fire - this causes the fire to go out.

If you do not stand in wow items the fire while the NPCs are pouring water over it, then the fires will not go out.

Early on in Dragon Soul the fire did appear to disappear wow items by itself, but this hasn't been the case in the last six weeks (at least) that I have been doing this encounter. (I am usually assigned to stand in the fire to clear it).

The strategy my guild uses (25 man) pretty much avoids dealing with moving from shadow/leftover wow gold fire in phase 2. We have our raid stand on the edge of the ship on the grey part, fires can not spawn here. Tanks in the middle and the rest of the raid should split evenly either side of Warmaster and the drake.

Raid collapses for shock wave and then runs back to normal positioning for roar. Raid members buy wow gear need to avoid standing in front of the drake due to breath when collapsing and melee should always be behind unless there is fire in which case either in-front(dangerous) or have the tank move to the side a little so that they can get behind the boss.

This blog post suggests that the encounter can be buggy which could contribute to the difficulties you have experienced. The blog also suggests some workarounds:
source:http://www.buywowgold.nl