When he felt himself go through a wall, the impact had come as a startle to him, but strangely, he didn't feel the harsh pain that would be derived from being driven into a wall. Was this part of his Vampiric powers? No wonder Elijah recovers quickly when he's thrown into the wall, thought Cassian, despite his life-threatening situation.
He had been unprepared for the attack, and that gave Abbot the bigger chance as he sat on top of Cassian, his grip on Cassian's neck tightened like he wanted to squeeze the living air out of him. Those horrific black eyes gazing intently at Cassian's red orbs carried deadly intimidation, and no one flinched or averted their gaze. The look in their eyes carried a silent battle, as if deciding they weren't each other's slave.