Lumi, mild as his default expression suggested he was, didn't cower from the now looming Alucard.

He looked up at him, it was barely an inch of difference, his pupils narrowed to predatory slits. His reiatsu didn't waver. There wasn't a flare, not even a blip. He kept himself, and his chakra, completely under control, barely narrowing his eyes as he stared down Alucard's challenge.

"Is there a problem?" He asked, his voice still soft, but now edged with something harder.

Lumi's expression shifted slightly. It was almost imperceptible, especially if you didn't happen to know him well, but it was there. His eyebrows drew in slightly and the bridge of his nose crinkled like a lion's with the threat of a growl. He didn't show his teeth, but it was a close run thing.

He, of course, was not a psychopath, but he did have a reputation to uphold.