I was raiding today with Queen of Hearts on my team, and came across a Baldur on defense.
Queen had her minion card up and taunt activated. Baldur charged up and fired. He got his health boost. However, rather than targeting Queen of Hearts (due to taunt) and dealing 150% damage to her, he would target a random member of my team, and the message “protected” would pop up on that hero and no damage would be dealt.