Seamus chose to fight as the wolf-creature, to see how it would be to fight in it. Immediately, time went back to normal, but his opponent couldn't move his feet, and Seamus couldn't, either.
Seamus's clothes vanished, but were quickly replaced by thick grey fur. His spine lengthened and grew into a tail. His arms and legs shifted and changed, with his feet becoming more canine and both his hands and feet becoming much larger. Huge muscles began to swell on his arms and legs and torso. His fingernails and toenails grew into huge claws. He grew much bigger and taller.
Finally, Seamus's head began to change. His ears migrated to the top of his head and grew pointed. He blinked, and his eyesight changed, although his eyes didn't visibly change, tinting everything with red. His head lengthened, and his mouth and nose extended into a snout. His teeth sharpened and grew huge. His sense of smell grew keen. The glow around Seamus changed from red to black.
After the transformation was finished, both Seamus and his opponent unfroze, and the opponent instantly charged and slashed at Seamus with a sword. Seamus roared as the sword sliced across his left bicep, and grabbed at the wound in pain. He glared at the attacker, and then leaped at him. The attacker swung his sword at Seamus but missed, and then it was too late. Seamus bit the opponent in the neck, and then he had won.