"Sir," Ed said, without turning. "Have you ever been shot?"
"Why would you want to know that?" Roy asked, looking a bit scared now.
Ed chuckled softly, and reached into the inside pockets of his red coat. "Just asking." He murmured, and slowly turned on his heel.
The moment Roy saw what Ed pulled out of his coat, he threw himself aside. "You are just jumpy are you not today, sir?" Ed said, over the roar of flames.
His entire desk was completely alight. "Edward, what the hell are you doing?" Roy yelled, from his crouched position.
"Sir, you see a bit cold. Why not stay still and warm up a bit!" Ed shouted back, aiming the flamethrower at him.
There was a blast and Roy dashed away. A corner of his pants became lit. He tripped and tumbled, batting at the flame with his sleeve. "This is no ordinary flame, sir! With all due respect, you will not put it out that way!" Ed said.
He was laughing now, maniacally. He grinned at Roy, even while blasting at him. "Tcch!" Roy hissed through gritted teeth, grabbing the hem, and pulled.
The fabric split with a ripping sound, the seams yanked apart jaggedly. He tore the corner off and tossed it away before his hands lit. "Not the best place to have such airy clothes, right sir?"
Ed stopped firing and Roy stood, panting, close to the wall. "Colonel Mustang, you see a bit tired. Maybe you should stay still for a moment, sir!" Ed shouted, laughed, and blasted again.
In truth, he was getting tired. Ed didn't seem fazed at all. He was spinning, grinning and laughing, following Roy's ever move. The room was becoming steadily hotter. Everything seemed to shimmer a little. While Roy was contemplating his next move, Ed was laughing. "Sir, you should take a break! You seem to have a slight fever. Maybe sitting down and resting would help, Colonel!"
Roy swore, he couldn't keep this game up. Ed probably had stashes of fuel to keep that thing going! He leaned against the wall, completely out of breath. "Ha ha! You are cracking me up here, sir! It appears that military men do not have much stamina, do they sir?"
Almost everything was on fire. The walls, the desk, the couches, the rugs. Soon the floor and ceiling would be engulfed. As Roy dived aside from yet another blast of the flamethrower, he realized.