Falling

Batman seized the opportunity to jump onto the suit's back. Judging from what he'd seen of its movements thus far, he didn't think it had the agility to throw him off, or the flexibility to reach back and get a grip on him.

Instead, the moment he put his full weight on the suit's back, it toppled backward.

The impact drove the breath from Batman's lungs. Black spots swam in his vision and he lost his grip as the suit got back to its feet and kept going.

Batman: Arkham Knight: Riddler's Gambit, Chapter 26, Pg. 277