The conversation they have when Heyoke looks at Shuik's body references the 'argument' they had when the moose attacked.

Although it's presented as a solider reprimanding a subordinate, it's not that at all. "If you want to remain a member of this pack you will begin acting like a wolf as well." She's not threatening him (although we want the audience to think she is), she's trying to keep her brother alive.