So the... 'youkai' on your world can regenerate limbs? While it takes time, science can do anything magic can do. It's a matter of understanding the world around us and how it works.

[He spoke enthusiastically, still taking a few more notes.]

He was made for a different purpose. I don't have my notes from the time - it occurs in my future - but I can make some guesses. If we were to replace limbs, the process would be similar but modified to grow only specific parts. The technology is there, it need only to be used.

[And, don't think he's not still paying attention to their main purpose.]

You recovered much more quickly. Shortly after eating.