Interrupting their orgy was very rude of you, the energy shrunken landing in the middle of the dog pile and exploding. Since they are all rather entwined at the moment, they cannot dodge it and get the full blow of the blast. The three of them screaming out in pain and surprise, while quickly getting back up onto their feet to scout the area to see what caused that! But since you are invisible and not moving, that is quite impossible. Still, they fan out, showing off their perfect doggie bodies while growling, fangs barred and claws out.