Enticed

"He's a monster in the face of a werewolf".
"He is more animalistic, more primal than any other wolf known to Lycanthrope".
"He is death personified"
And the theories go on. Not many know how he truly is. What we knew was that you do not wish him as an enemy. For you may not survive to wish for anything else.
Leah wasn't a wolf of high ranks but neither was she an omega. Yet, she failed to understand why the Beta's son and her mate would reject her for a she-wolf he had claimed. Even the omegas were treated better in the Peace Falls Pack. She was hurt and embarrassed and frustrated in more ways than one. She was waiting for an opportunity to show the future Beta what he had lost, to show him that she wasn't a weakling to hide in her room forever because of the rejection. So, when an opportunity in the form of a strange but powerful and wounded wolf passed by, she all but grabbed it.