I've been bringing Zerro to the 9-7 weekly challenge and have been struggling to eliminate the enemy column in round 2. I finally noticed her Shadow column skill has not been activating. It is a level 15 skill in a level 22 difficulty stage. She has 100% SB. I'm not really sure what's causing it not to activate as i have watched videos of people using Piz'fer's Ice column. Has anyone encountered an issue like this?