The fight between Rio and Amy was starting to last longer and longer. And when it officially crossed the 10 minute mark, to not bore the audience, and getting the winner faster - Agnus removed the restriction on usage of aura.
The duo immediately felt the changes around them, without needing any explanation. Yet while Rio's face lit up in a smile, Amy's expression darkened like the belly of a pot.
And her gut feeling of fear and uneasiness wasn't wrong, as the moment Agnus put down his sigils, a dark shadow rose from the ground and grabbed at her throat.
Aura manifestation in corporal form.
"This is cheating." Amy shouted, annoyed at how one vs one battle suddenly turned into one vs two. Because of how absurdly high mastery her brother had over aura.
While she could just cover her body, strengthen a few muscles, Rio could literally project his aura into physical form to help him fight.
