"Reflectaga!" Oner raised his blade of light, crystal like pieces now floating around it as he quickly held the blade in front of him as a shield as the flame wave headed towards him. The flames would hit, but hit the blade. Reflect, the barrier anyway, captured attacks and sent them back as part of its magic. That much was true. Oner was also extremely adept at controlling his magic. While he may not have had that many offensive spells, that didn't mean his foes didn't. Instead of sending the flames back though, the flames were captured by the Reflectaga in the blade, or at least all of the flames that hit him anyway. 

All of the flames that had hit him were now his now, a part of his magic, and thus his to control as suddenly the Keyblade changed. Now instead of being a blade of solid light, it was a blade of swirling light and white fire, Oner glaring at the figure. "Get the others out of here Joshua..." He looked back towards the other Keyblader. "Ill hold him off while you all escape." It was clear that this man was incredibly powerful. He destroyed Shiva, a high level summon, instantly, and didn't even look like he was trying, which made Oner unsure of whether or not he could win, especially without the use of their trump card, or if even all of them teaming up on this man could win. "Lets see how thee fares against thine own flames..." He muttered this before charging forward. Oner's speed had gone up recently, thanks to the permanent Haste affect. His speed was with magic, and Hasteaja made him extremely swift. 

When he got to the figure a few high speed slashes of his blade followed by a highly dense orb of Ultima right to the mid section as part of the extremely swift combo attack, which was finished off with the Explosion finisher, three orbs of light and magic flowing around him meant to each slam into the foe, something that he was adept enough at that he didn't have to stop moving to do so. Oner wasn't going to go all out yet, not until he knew what this man was fully capable of, but he figured he certainly wouldn't attack lazily, lest he had a death wish, which Oner certainly did not, so Oner was giving it his best shot.