hack or bug ?

i need to have your opinion before i report .
i have 2 replays of that same guy and on both he does the same things
He start as normal , move to a place then hs stop and look around then reappear near an opponent and kill him .
Is this a bug or a hack ? anyway he is using it at his advantage . . thanks for any answer that may help me .
forget to say it`s on GM and he is BL

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