The elves! He had to ensure their safety first. He did not currently know what the true length and depth of Bella's plans were. And the elves were probably just as in the dark about her as well. Ava caught the look on Alex's face and saw that he was having a little of an internal conflict.
Her heart nearly gave out. From the poor girl's perspective, it really looked like he was probably thinking of the best way to get rid of Mia and herself. So, she began to beg him profusely;
"Oh kind stranger! Please spare our lives! We were just following orders I promise you! Please!"
If not for the fact that she had started speaking again, Alex seemed to have forgotten all about Ava. He glanced at Mia who was still passed out cold from the lovemaking. The threats had been neutralized. There was no point in sticking around any longer. So, without even as much as a single word, he teleported right out of there in the blink of an eye, leaving the dazed Ava and the knocked out Mia.