Happened to me in christmas map also,but i couldnt attack with mirana.basically it was fight,kunkka from enemy team survived,and me mirana.i had more hp so he started going back.i jump to cut him off and then mirana just walked near him,couldnt attack.like i issued follow order.tried clicking,using keyboard and nothing.had couple of seconds cause we were both WTF.he thought i would kill him,me also but at the end i died,and my whole team started raging what the hell am i doing,why i dont attack etc