The dragon turtle lacked True Sight and couldn't see through Leon's true form. In fact, Leon's current youth bronze dragon form was created using the 72 Transformations. Even someone with True Sight wouldn't easily see through it—at least not without the strength of a Demon Lord or Great Devil.
"You're clearly a bronze dragon, why pretend to be a red dragon?" The dragon turtle didn't believe Leon's words.
Leon didn't bother to explain and simply smiled, shaking his body. The youthful bronze dragon immediately transformed into a youthful red dragon. Although it was a youthful red dragon, its body was nearly gigantic in size, so to the untrained eye it appeared to be an aged red dragon. He then asked, "What about now?"
"R-red dragon! How did you suddenly turn from a bronze dragon into a red dragon?" The dragon turtle was completely stunned.
"One simple shape-shifting is enough." Leon wasn't interested in explaining that his transformation technique came from the 72 Transformations.
