Dominique protected Marceline from getting stabbed by sacrificing his body. Since he hugged Marceline, the tip of Natasha's surgical knife was buried at his back.
Dominique started to bleed but he was not in pain. For a werewolf like him, this kind of wound was tolerable. It won't affect him that much as the knife was not made of silver. It would heal easily because of his regenerative ability.
Marceline immediately took action when she noticed that Dominique was hurt. Using her hand, Marceline hit Natasha's neck, knocking her out.
Natasha fell to the ground as she lost consciousness. Then she helped Dominique to stay still as she called for help.
"Mr. Dominique, are you okay? You're bleeding!" Marceline pressed her palm against his wound to stop the bleeding.
Deep inside, she felt touched. She didn't expect a stranger to protect her. He sacrificed his body for her not to be harmed. Her heart suddenly softened towards Dominique.