It's all about experience, she has more experience killing humans while our MC is a monster killer. Fighting humans is vastly different from mindless beasts
Chill out Elk, nows not the time to destroy your siblings. Revenge is best slow, you don't want them expecting it because then they'll make preparations against you. Stay low and keep your head down for the time being. Make them think you don't care about what they did
Yeah, I just worded it wrong. I do agree that this author did it fairly well. It’s not shoe horned in, but shows/hints at how it happened right before it happened rather than just have a “WITH THE POWER OF LOVE AND FRIENDSHIP…”