Helluva Trio pg 61 inks (commentary) (Patreon)
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So, this is me taking a gamble and being a little daring.
Obviously, Loona is acting out-of-character here. But I don't think it's too much of a stretch. As Blitz and Loona agree: "She's very sensitive!" "Yes I am!"
Considering how nervous she was going into this and how suddenly forceful Millie was being, I think it's easy to see how she might feel she was taken advantage of by people she was heavily trusting in the moment. Had it been other people, she definitely would've bitten their heads off and stormed away.
But because this is from two of the people she's closest with, this is her reaction instead.