Damage on first move

I have another question. The Last time I had one it was answered quickly. I fought someone in a raid a few mins ago. The two times I fought this person I took damage on my opening move. I fired off three yellow tiles at the hero on the far left and one of my yellow charectors took damage. I amxnot sure why this happened. Here is a screen shot of the team I was playing. If anyone has any thoughts I would appreciate it.

Without some kind of video/ screenshots of it ocurring it’s hard to tell… Mostly likely situation was simplyu that your yellow hero got hit by the enemies “slash attack”