Talk:Summer 2015 Event/@comment-84.90.161.45-20150828093723/@comment-26329527-20150828100410

if your damage to a boss is below 0, you will do scratch damage, which is 7-12% of her HP.

this means your terrizuki didn't do damage and scratched while Haruna either scratched a lower hp BB hime or managed to get past her armor for 30 points.