(A/N: Happens at the beginning of practice before the fight between Jaune vs. Cardin)
"Mrs. Goodwitch? I'd like to fight Yang Xiao Long in a mock battle. That is if she will accept." Nathaniel said, standing on his chair in order to be seen over the heads of the people sitting in front of him.
"Nathaniel? Are you sure you can withstand attacks from someone of her caliber?" Mrs. Goodwitch questioned, nervous about his safety.
"Well, I wanted to fight someone with strong enough hits so that my semblance can be used effectively, so I had to choose between Yang, Nora, or Yatsuhashi, and I believe that I can use Yang's elemental affinity for fire against her. Yang, do you object to sparring against me?"
"No, but I'm not going to hold back." Yang responded.
"Good, that means I don't have to ask you not to." Nathaniel replied gleefully, pulling out two red daggers and easily leaping the twenty feet from his seat to the arena and landing on his feet. Yang took the more reasonable route to the arena via the stairs.
"Are you ready to fight?" Yang asked cordially.
"Sure.." Nathaniel answered.
"Ready? Begin!" Mrs. Goodwitch announced.
Nathaniel rushed at Yang, both of his daggers drawn, but was punched in the gut before he reached her, causing him to slam into the far wall. "Gah, I never thought I would be forced to use my semblance after only one hit." He said, glancing at his Aura Monitor and saw his Aura instantly regenerate from the losses of protecting him from the hit.
"Wait, shouldn't your aura have been depleted significantly from that hit?" Yang asked, confused.
"Yes, but I recovered it using my semblance. Partial shapeshifting. Basically, I can turn into a faunus of different creatures, gaining their abilities when in that form. You completely wiped out my aura but a phoenix can revive from death an uncountable amount of times, so therefore as a phoenix faunus, I can regenerate my aura completely." Nathaniel said, standing up, flaming wings now extending from his back.
"Hm," Yang muttered, contemplating the new information. She fired a shot at Nathaniel experimentally, his wings absorbing the fiery blast. She fired a second blast, this time hitting the wall behind Nathaniel. Seeing a water pipe in the wall, Yang focused her attacks on the pipe rather than Nathaniel. Soon water was shooting from the pipe. Nathaniel noticed what she was doing, and responded by throwing pulled out a vial of dust.
"Good strategy, but it's hard to smother a flame with ice!" He said as he turned around and froze the spray of water midair using ice dust. Belatedly realizing that he just accidentally turned the spray into thousands of tiny blades of ice, Nathaniel jumped backwards before the blades hit, only to be tackled by Yang.
"Gotcha." Yang said triumphantly.
Nathaniel dropped his daggers, raised his hand, and said, "I surrender. Though she probably cannot deplete my aura, I can't overpower her or escape being pinned down."
"Yang wins." Mrs. Goodwitch announced.