You know, I have my issues with Heather killing Snowbird... And it's "validated" because she felt that she had no other choice.

But man - come to think of it, a lot of members of Alpha Flight have had some pretty questionable things...

For example, even Snowbird murdered a team mate - Sasquatch, by ripping out Walter's heart, because she discovered that the Great Beast spirit was residing with him...

Marinna went full, lethal alien, in Avengers....