Even tho Elena might have said that they shouldn't mind her but that was impossible. Even after Elena said that, nobody be it the assassins or the teachers, moved. Elena became unable to read any of their minds just after her declaration. That means, everybody completely lost any will to face Elena. Now even if she tried killing them, they would not even try to resist at all.
From that reaction Elena understood that the weight of a demigod was way more than what she initially thought. So she changed her mind to suit the situation.
"I see that you all will not fight anymore because of my presence here. Even tho I don't mind for all of you to continue what you were doing before. But from what I can see, ignoring me is impossible huh."
"Actually that's good too. Now I will go and bring those two back. As you all had stopped fighting, so don't fight anymore. It will not take much time.
