The very moment King Gregory stabbed Alita, his invisible form fell off revealing his physical self. The same thing happened to everyone who came along with him which included his personal bodyguard, Henry, and about fifteen other elite guards. This, coupled with the fact that the princess had been stabbed, elicited series of gasps from the people around.
"Oh, yes. It is done... It is done." Samantha screamed excitedly into a phone which she had pulled out of her dress pocket. Her face was beaming with joy despite being held down by two vampires. Her voice pulled everyone's attention from The King and his people in her direction.
Asher, who was already boiling in anger, disappeared from before the king, and appeared behind Samantha, freezing her heart instantly just the way he had done with Sapphire.