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If Xavier was ask to share his experience in attending the birthday party's that night he will immediately to give zero out of 100 mark without taking too much time to think.
Maybe because before this he was just expose with a formal banquet with a strict rule to follow and even their attire also had a dress code they need to abide.
The party even small or big party was a stage for them to show their power and status. It was a battlefield for a noble or wealthy people. You could not even to dare to put your guard down even a moment if not you will lose in the battlefield with all enemy eye is eyeing you in all direction.