Sebastian nodded curtly, right hand pressed over his heart in a brief salute. "Of course."
He didn't bother to offer to 'go up' instead, though he was fairly certain he was more adept at gravity defiance than this fighter. He didn't seem entirely human, but he certainly didn't reek of demon like the monsters (or Sebastian himself) did. Still, he was obviously quite effective and working with someone competent was refreshing.
It meant he could just focus on the task at hand, which was turning out to be easier than expected. True, there were still passersby around - people too stunned, injured or dumb to have fled - so he wouldn't be able to just obliterate them in his natural form. Still, he thought as he used a clawed hand to slash a hole in the side of another creature, this wasn't too difficult.
Especially if he could count on his new ally to keep an eye on his back (and even if he couldn't, well, a few smoke demons weren't anything a master butler couldn't handle).