The issue:

When using the goblin "raid" skill unmounted to signal the raiding party, using the "flaming arrow" skill can trigger a volley of arrows that hits all enemies in the room. However, while this will not hit anyone in the goblin's party, it will hit charmed mobs that are owned by the goblin if they are outside of the party. Including the goblin's mount, even if mounted.

To replicate:

1. Have goblin with mount and/or mercenary follow another player character. The other player groups the goblin.
2. Goblin uses "raid" skill unmounted
3. Goblin can mount or stay unmounted I do not believe it matters
4. Begin combat with some mob
5. Goblin uses "flaming arrow" skill until it triggers the volley
6. Observe volley hitting the mount and/or other charmed mobs, which will then no longer follow the goblin and start to fight the party

Here is a log of this happening. In the example, there was a mount, a mercenary, and another charmed mob, all of which got hit by the volley and turned on the goblin:

*snip log*