Slides through door

As soon as they were back in the hallway, War pointed at the far door. “Hit it low,” he whispered. Ruin tossed his mane in acknowledgment.

Again the great beast charged, and again War rose. Without the first hint of difficulty or imbalance, he slid his right foot from the stirrup and placed it upon the saddle, so that he rode in a one-legged crouch. Then, as the wall drew near, he jumped.

Ruin dropped his front legs as he hit the door, smashing it open with his head rather than his hooves. As for War, a single blast of the cannon opened the wall above the door. The momentum of his leap carried him through as though he had an angel’s wings himself.
The guards within were, of course, ready and waiting for the intruder to come bursting through the door. When Ruin came in beneath their anticipated line of fire, however, and War above it, it took them an instant to reorient themselves.

War’s stolen cannon, and Ruin’s thrashing hooves, denied them that instant. Half the guards were dead before the Horseman’s feet had touched the floor.

***

The Abomination Vault, Chapter 9