Costigan scowled at the laugh, though whether it was a caring chastising or a passively annoyed response was difficult to tell. With the answer, his expression evened again and he gave a nod. The injury being entirely hidden didn't surprise the undercover much. It was a smart move, given how many might use it to their advantage. He also recognized that it was very telling that Bakura had allowed him to see it.

"If your body isn't yours or anyone else's, then what is it?" This was the first time he'd heard of someone being less than exact. Even Bruce Banner has expressed both confusion and admiration of the kedans' ability to replicate his complex DNA, with all its.. peculiarities. It was something to ask Evandau about, at the very least.

Costigan's gaze again turned to one of confusion and concern as he stared at the lines. It was an important piece of information, one he wondered if Bakura knew the significance of.

"Thanks." For showing me. "Most of the scientists I knew are gone, but I can ask around about that too."