non-leve monster attacking a leve monster

Time: 24th February 2015, 14:32 GMT+2
Frequency: Once
World name: Cerberus
Character name: Drei Rael
NPC name: -
Monster name: Gigas Bonze
Class/Level: White Mage 50
Party or solo: Party with Chocobo
In-game time: 11:10am
Area and coordinates: Mor Dhona 29x 14y
Steps:
1. I started Leve "One of Our Naturalists Is Missing."
2. I found a Wanted Target named Gorn the Garrgh.
3. Saw Gigas Bonze attacking said Wanted Target with Bone Powder only before I even engaged either of them.
4. After I defeated Gorn the Garrgh, Gigas Bonze stopped attacking and went idle like nothing happened.

Connection Specs: 100/100Mbit fiber, Telia.

http://i.imgur.com/W1aqwIU.jpg