OFA bug

Hello So today I played some OFA wit my friend and we got to play Fiora against Galio (that stun lock omg) and we took herald put it mid and went farming again. This all was normal but then Galios took baron in about 16:40. We were stunned by that like how is it possible. So then I went to see match history in client and I found out that it says Herald was not slain but it shows Baron killed in 16:40. So is it a bug or how is it possible?
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