The guards were not really that alert and were pretty lax because they did not consider the human messenger as a threat.
There were three of the strongest witches in the throne room. Just who could possibly do any harm to them? Only the grand ancestor of the demons, who is known to not really like violence that much, would be able to fight with them evenly.
That's the grand ancestor of the current strongest race we are talking about. Why would the guards associate a normal human messenger with someone as strong as him?
But that was where they had made a critical mistake.
When the window broke and the queen and princess of Aduseon flew away for the sake of their lives, the guards finally realised that something was wrong.
The battle between the grand ancestor and Harry happened in the span of a minute or two.
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