Veigar bug

So basically in the first part of the highlight I have Fog of War on (you see what I saw in game), in the second part Fog of War is off, so you can see everything that any champion could on any team. When the Fog of War is on I can´t see the cage, that is what I´m considering a bug. Is this a bug or a "game mechanic" you need to learn ? I think it´s a bug. And btw it cost us the game.
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