This is just a Theory,

I think with the rumored Necromancer up and about (Most likely Keith), I think probably after the battle between Gray and Silver, Juvia will appear before Gray, she will hug him and he'll hug her back, but not before Juvia attacks and mortally wounds Gray thus would collapse due to his injuries. The reason why she would attack him is because she was being controlled by the Necromancer.

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