Just to clarify, the lizard is SCP-682, and the girl is SCP-053, 682 is invulnerable because it can adapt to literally anything, and 053 causes anyone who touches her, looks her in the eyes, or is near her for 10 or more minutes becomes murderous, and the moment they attempt to harm 053 they die. When the put both into a room together, 682 became completely docile, fulfilling the main rule of "who would wins," that the underdog MUST win/