Time: Any Time
Frequency: Always
World name: Ragnarok
Character name: Yow Rabntah
NPC name: N/A
Monster name: N/A
Class/Level: Bard/50
Party or solo: Party
In-game time: Always
Area and coordinates: Second Coil of Bahamut, Turn 4.

1. Target the ground under Nael Deus Darnus with flaming arrow area of effect.
2. Look on the color of the circle while using it so you are sure you can use the skill.
3. Use Flaming arrow and observe that most of the times doesn't land.
4. Move the position of the Flaming arrow area of effect and try again in a different spot.

I tried many times, and loosing lot of damage thanks to most of the battleground is buged.