Sam and Dean slowly descended the ladder as quietly as possible. The beast seemed to hear, as well as it use to be able to see. Sam spotted the creature snorting in the air and grumbling what sounded like human words. Somehow, they reached the bottom and slowly proceeded towards front of the barn near the scratched through barn door. Dean and Sam set up positions in opposites sides of the front barn area.
Dean nodded to Sam and Sam returned the gesture. Both pointing guns in each hand, they opened fire on the Manticore. The creature loomed in the air and rampaged towards the front of the barn.
Sam stopped firing and the creature headed for Dean. Before the beast could reach Dean, Sam opened another barrage of bullets. The creature flinched and, Dean stopped firing and changed his position. The creature slammed head first into the west barn wall.
Sam continued his onslaught. The beast turned and rampaged towards him. When the beast got too close for Dean's comfort, he opened fire again. The bullets may not kill him, but they do hurt. Sam stopped firing and changed his position. The beast realized Sam had stopped and skidded to stop his run. It could not stop its stride in time and its torso twisted. He thumped in the east barn wall.
Dean's plan was working perfectly. The gun fire kept the manticore from hearing them change positions. The blindness allowed them time to move before he could get too close. The thing knew they were playing it. They wouldn't get it to knock into many more walls, but they could play this gun play Ping-Pong until the right opportunity presented itself.
Dean fired a newly brandished weapon from his waist and fired rapidly. The creature didn't run this time, but stalked closer. He used his front claws and tail to canvas the area before him. Trying to ensnare Dean and keep him from moving. Again, Dean stopped firing. This time the beast was further from him, but they had to change tactics to match the creature.
Sam took up the hail of gunfire from Dean. Dean moved closer to the broken barn door. He rapidly started to reload his guns. Sam continued his fire, but the creature had pinned him in the corner with no means to escape. It widened its swing, keeping Sam from moving to a safe distance. The beast was just past the mid-point, but a safe distance for Dean to take action. Dean dropped his guns brutally to the ground, pulled a pin on a grenade, and lobbed it at the creature's hind quarters.
The projectile smacked against the creature's body causing it to jump back further into the barn. The fire cloud erupted from the grenade knocked Sam back into the wall but did not reach him. The creature was not as fortunate. It managed to avoid substantial damage, but the fire burned a good portion of its face and left flank.
The manticore became enraged and flicked his body and head wildly. He rolled around on the barn's dirt floor, up righted himself and charged back to Dean. It didn't concern itself with slamming in walls, but darted toward him with molten fury. The creature roared wildly only a few feet from Dean.
Sam picked himself off the floor. He had watched the creature's progress on Dean throughout the battle, allowing more time than usual. Dean was not moving as he normal would and it was not the time Sam was going to chance it. Sam realized the blast had interfered with his vow. The beast was too close to Dean.
The beast's roar resonated in the barn's loft. Dean felt the hot breath on his face. The manticore cocked his head and opened his jaws to snap. Dean yanked a grenade pin and heaved the explosive down the creature's gullet.
"Dean" Sam yelled. Dean was too close to that explosion. Dean dropped with a loud smack and rolled under the tractor.
The creature's upper body and head smashed outward and spatter widespread over the barn. The upper back and hind flank heaped over it a molten mess.
"Dean!!!!!!!!!!!!!!!!!!!!!!" Sam's voice found no response.