Abigail's rage does not increase when she is struck by Shadowblade's From the Shadows ability. I am attacking with Abigail, they are defending with Shadowblade. Shadowblade goes first since he is defending, casts From the Shadows, teleports behind Abigail and whacks her for x damage. In theory since she has just been wounded her rage should go up 1. It did not. And it wasn't purged because at the time she had 0 rage so nothing there to be purged.