Alex had left the hall hoping for the plot to continue.
The plot here means the plot where the protagonists have themselves look bad in front of many people, but then suddenly they turn the tables.
This event would leave a lasting impression in the heads of many people who witnessed the scene, causing the protagonist's fan following to increase, but along with fan followings, they would also enter the sights of the people who would not like his huge gain of fame.
Lokiath was a new protagonist, someone who shouldn't even have adjusted to this world, yet he was here, which means he was supposed to get very big plot armor—or a starter's boost in this event.
Alex wanted to see it go down.
But the thing that made it impossible for the plot to progress was his presence, so here he was now, standing outside of the ballroom, caressing Noctura as she slept in his arms.