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That being said, there are some rare instances where people inform me to recall my beast after I've run or been killed myself. I tend to remember that and return the favor as often as I can.
Not just limited to Lusternia, but I've always been of a mindset that killing their mounts are perfectly fine if it's in the middle of combat; they serve their purpose as a combat aid, so removing that aspect to give yourself an advantage is a completely valid move, or if it was left in your city/org territory and they're an enemy of said org.The rules I generally have are:Randomly killing someone's beast purely because I dislike them, or they're an enemy to my city/org. That's just being a dick for no reason, plain and simple.This overrides all of the above: If killing it will result in the beast/mount permanently dying, I'll leave it alone 99% of the time unless it belongs to someone who has a history of being an asshat to everyone else. Generally speaking I'll do my best to ensure everyone I'm with follows that, too. I don't really care what it cost; if killing will perma death it then I don't touch it. Period.
Unfortunately it can be difficult to discern what current level a beast is at and whether or not another death would 'push it over the edge'.