Johnny panted and let his legs fall to the floor. He was too crushed to even move. His chest could barely lift under the strain of all the gravity, and his lungs and heart were gasping for air and oxygen. His legs could stand the weight easily enough, he'd trained with heavy cast-iron weights on his lower legs back in Basin, after all. His body, however, wasn't trained to that extent, and he was suffering for it.

This was far from a fair fight. As much as he hated to admit it, the further he fought the worse it got for him. It was only a matter of time before he conceded defeat.

From his place on the floor, he craned his neck forward to get sight of his foe.

He was advancing forward with cruel intent.

He could only defend at this point, and air pressure could override the crushing gravity easily enough.

By creating sheaths of compressed air under his calves and heels, he detonated them and used the force to flip himself up and over, executing a backward roll onto his feet. He planted both hands on the floor, feet wide and legs wide as his body bent close to the floor. 

He had to do it.

The Crash.

The innocents in the room would suffer, but he had to ensure he had the advantage.

Bracing himself, he gathered all the strength he could muster and took the deepest breath he could manage. It would give him about a minute of life to deal with his strongest area attack.

He gathered air, more than he'd normally use, compressing it into bundles and sheaths around his legs. Of course, since the room was so huge, there was a huge amount of air, and the more he compressed, the less it would be like a bullet, and more a bomb. He'd only pulled this off several times, to extremely good effect. No fire, no fuss, just a compressed air bomb that destroyed environments and left him unscathed. Usually.

He struggled to stand upright, even as his legs sucked more and more air out of the room, accelerating the process of creating two huge invisible bombs around his waist. The air would get thinner and thinner with each second, making it harder and harder to breathe. Next to this, he built two balls of compressed air underneath his feet, completely separate from the bombs he was making. He'd use the balls to blast himself into the air as the final prep for the Crash.

The air by now had reached the consistency of extreme high altitudes in the span of a second and a half.

It was time.

Johnny detonated the balls of air under his feet, rocketing into the air past the higher gravity. He barely reached halfway up the room before that same force began pulling him back down, faster than normal.

With his mind, he shifted the air so all of what he gathered was now under his falling feet in a massive bubble.

When he impacted the ground a second later, it took him an additional split second for the bubble to compress, before it popped.

The shockwave created was massive and intense, in similarity to a high yield explosive detonating in the center of the room. The rapidly expanding air drove everything not bolted or tied down against the walls and ceiling. Glass vaporised, wood shredded and people screamed and were hurled around like confetti amidst the chaos within the center.

And, in its epicenter, a tired, stressed out Johnny, seemingly unaffected by the whole deal.

The created blast would be something akin to standing way too close to a military jet taking off from a standstill, and expanded around Johnny in a sphere, crushing everything and sparing nothing.

Not even gravity would change any of this.