@bat_girl_cc: The suit's capabilities probably weren't established that well yet. His suit could just not be able to take incredibly sharp weapons. Plus it was in Nightwing after all. I find it strange that you'd say Batman's reaction time is better than Cass's...even though I think that might be due to his experience dodging them. He has been doing it longer.
Cass is overall faster, and more agile, but Bruce's reaction time, is nearly perfect for a peak-human, that's how he dodges sniper-bullets after they've been fired, and he's able to side-step super-fast enemies...and i didn't said Batman's reaction time is better than Cassie's, first of all, i'm not even sure of who reacts quicker...i said, they might be on pair, or Bruce's possibly higher...that's a huge difference! xD