The stamping of Rowan's foot shattered the ball of flesh that had been drained from outside and within. Outside by the least, and within by him.
Rowan hung in the air for a single second, he had noticed that the gravity inside the stomach of the beast was weaker than what was available outside.
Before his feet touched the surface of the stomach of the beast, in that brief moment when he was in the air his eyesight perused the overall state of the stomach.
Unlike the stomach of a mortal creature that usually contained some sort of fluid, and was constantly in motion, the stomach of this creature was bone dry and looked like a cave with hundreds of glowing crystals scattered around, and it was cold, enough that Rowan had to begin diverting a lot of resources to keep his organs functional.