Grym's fire hand expanded in size and stopped Jun's attack, but didn't destroy it yet or anything. It seemed he was having issues with it. But not enough to stop him from stopping the other fire attack. The guy slammed the ground with his other fire hands, creating a fire wall that stopped the stream in its tracks. With a different fire hand, he attacked again, using the flames Jun had blocked earlier. They didn't ever really went out...that was good to know. Jun withdrew his hand, and moved to the right, running, avoiding it. Creating a smaller fireball of the same caliber of the earlier one, he blasted it up at the stream connecting the hand to its owner, hoping to sever that link.
Then he closed his hands, and made a tiny opening, spiraling flames inside it. Then he fired it, a small, thin, but barrier penetrating beam of fire aimed at the left leg. If successful, it would leave a perfectly cauterized wound at the thigh, without hitting any bone. But sure to hurt like hell and ruin any concentration. And if that happened, Jun would use his flames to propel himself forward, and righting into a double kick to the chest. Hopefully with enough force to knock him out of the ring.
If it was dodged, Jun would simply keep an eye on those fire hands, and slow down to a walk.