With a solid 'phwunk', the arrow shot into the side of the ship's rail, right by his hand. While Ace heard the arrow's whistle before it landed, something about it didn't trigger his 'Observation'. Maybe it was just a warning shot. With arrows, though? He scowled his confusion, plucking the arrow from the deck.

In response, Ace held up the arrow on the flat of his palm and set it aflame. Ace's outline would become more clear, like a black silhouette panned in front of a flame. His fancy hat and mantle were likely easier to see, then. His answer lacked symbolism, rather than him simply saying with his actions, 'That's what I think of that.'