The two Phoenix Knights didn't rashly enter but stopped at the door, where one of them gulped and lifted their armored palm to the door,
"Knock knock..."
Afraid that the person fighting inside might not hear, the knight knocked hard on the door, but after waiting several seconds, the "symphony of sounds" inside grew louder, yet there was still no response to the knocking.
Just as the knight reached out his hand to knock again, the high-pitched sound inside reached a crescendo and then abruptly stopped, like the end of a song, leaving only a lingering, ambiguous echo.
But the next second, a somewhat serious female voice forcefully broke through, tearing apart the ambiguous atmosphere and revealing to the listener the biting cold wind from the Northern Realm,
"Come in."
"Yes."
The knights gently pushed open the door in front of them, revealing the chaotic interior of the room.
