Getting slammed onto his back on the incredibly solid ground is not fun, his back probably bruised from his very first landing here. But at least this time he doesn't get his breath knocked out of him, there's just pain, and right now he can deal with pain. Pain is focusing, in a way.

He can see the walls crumbling at them, about to bury them, and he acts in pure instinct, making the rubble fall through them instead of onto them.

"Don't let go of me," he orders Daniel, with a hell of a lot more intensity than he's shown since he got here.

This is important. If Daniel lets go, it won't end well. But they can't stay here. Seth can't keep them phased out like this forever, especially with his current physical state. And if they get properly buried by rubble, even if they won't get crushed by it, there won't be any air to breathe. Holding onto Daniel tightly, he pushes at him and tries to get to his feet.