Mira watched in shock as Kai's attack was dealt with so easily, seeing him try his best to stand despite the intense burns he must have had all over his body from the lightning strike.
She saw how Alister watched as Kai tried his best, proceeding to kick him in the abdomen every time he tried to get on his feet. He was obviously far stronger; with his total combat power, he should have done away with the rest of them like he did Aria.
She remembered what he said, the sick smile he had on his face before he proceeded to burn Rex to an unrecognizable corpse.
"He's toying with us... We don't stand a chance against him... And if we all keep this up..."
"Then..."
"We'll all die here..." Finally realizing how dire their situation was, she turned to flee.
"No... I won't die here. I have my whole life ahead of me!" she yelled.