What did katniss notice about finnick at the cornucopia?

At the Cornucopia, Katniss noticed that Finnick was both confident and vulnerable. He appeared to be a skilled and charismatic fighter, but she also sensed a deep emotional pain beneath his charming exterior. His interactions with others highlighted his complexity, as he navigated the treacherous environment with a mix of bravado and underlying sorrow. This duality intrigued Katniss, making her more aware of the burdens he carried despite his outward demeanor.