Hnn, Tabane would have had to kill Chifuyu or made it look like she did before Ichika would do something like that. Unless she made it a point to keep insulting them at every turn, especially Chifuyu, whom she might have regarded as something close to an equal to her but she went and did something 'stupid' just for the sake of having a family. ...saying stuff like that might get Ichika mad enough to at least attempt it.
Wait, is this for the RPG or just general...?