The distinction between plasma and fire has always been a bit hard to pin down with different scientist proposing certain distinctions and definitions based on their own findings, put simply the majority of flames are at the [u][b]very least[/b][/u] plasma-like albeit on a smaller scale. Your average fire is mostly plasma, if only partially ionized and dominated by collisions instead of the free range atoms of a star. Theoretically using a precisest manipulation of flames one could do some neat and crazy things with plasma such as controlling its arc similar to a welding torch, use its potential difference to lightning bolt people, or even manipulate the magnetic field of the area. 

Errald "Ash Blood" Ris does not know any of this. Instead he elects to bat the grenade out of the air with the flat of his sword, sending it roughly in the direction of its thrower. 

"I'm sorry you're not GAME for diplomacy," Errald retorts, congratulating himself on the banter, "But if this is what you want I'm fine with watching your plan crash and BURN. But try not to MELT, with rage!"