Abaddon hadn't challenged Kami unprepared. Before going up on the rooftop, Abaddon had silently casted a dark rune of protection on himself, something which came quite in handy when Kami dodged his initial stream of energy, teleported behind him, and zapped him with a huge amount of electricity. The magic was able to negate most of it, but not all. Some of the surge still got through to him, providing for a painful experience. 
Abaddon dropped to one knee, his body sizzling from the jolts. Still, he chuckled as he slowly healed and watched Kami suffer. Now he knew what to watch out for, and a good way to wear down his opponent.