Only one problem with that. The gunshot was definitely a handcannon, not Vestian Dynasty. If there had been no gunshot, or Petra was also carrying a Handcannon, I would argee with you. But since the guardian was the only one with a handcannon, it doesn't leave much to the imagination.
English
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Maybe the guardians kill shot with the ace is what broke the gun, it never fired, or is misfired not killing Ukdren and only Petra killed him, although the plan was both.
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When you go back to petra and she gives you the vestian she says that "this is the gun that .... you know"
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The gunshot was definitely both guns fired at the same time.
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<I'm inclined to agree. I heard a loud shot but I heard a little *pew* in there too.>