Time: 06/08/2016
Frequency: One Time
World name: Behemoth
Character name: Ruruzan Fufuzan
Retainer name: N/A
NPC name: N/A
Monster name: Ochu (I believe)
Class/Level: White Mage/46
Party or solo: Party (Chocobo Companion)
In-game time: Don't remember.
Area and coordinates: East Shroud Larkscall
Housing: N/A
Steps:
1. Engaged in combat with a mob partied with my chocobo companion.
2. After the mob was defeated, the companion continued to be in fighting stance, and the fighting music kept playing. I had no enmity and there were no more mobs in the area.
3. As the companion did not recognize that combat had ended, it would not heal and you could not mount. To correct, I had to engage in combat again and flee. Then it stopped.

Unsure if this is a known bug, or not. Perhaps it is not a bug, and there is some mechanic I'm missing that'd keep the companion in battle (an affliction applied, maybe he got enmity of a mob that another player then attacked?). Don't know... but this feels an awful like a bug to me. Unfortunately, I'm not sure there is any way to reproduce it. There was nothing odd or spectacular about the combat. For whatever reason, the chocobo just decided it wanted to keep fighting forever.