Raya, Myst, and the rest of the Regis Elite almost popped their eyes out at Ames's display of strength. It was not as if they had never witnessed an overwhelming strength that could reduce someone to nothing before because when they underwent training in the Tower of Tribulations, they were among those who survived plenty of near-death experiences, which involved getting caught up in a battle between Sovereigns, or a Sovereign going on a rampage and massacring a city in one of the unclaimed planes.
Still and all, there was a huge difference between those Sovereigns' display of strength from Ames. One was the target of their display.
Ames did not simply kill a Sovereign of the Lower Realm but from the Higher Realm. Raya, Myst, and the rest of the Regis Elite also sensed that the mage she killed just now was far stronger than a Sovereign. The Higher Realm was still unknown to them, but one thing they were sure of was all of its inhabitants were definitely superior.