(The odd inclination to explain himself nearly overwhelms him, but he blames it on their environment and pushes it back.)

He recovered from the wound you gave him, but as he is now, here, he does not recall as much as I do. (The difference is likely only months, but that makes such a difference for one as busy as him.)

Why else would you have their hair locket? Did you not make it yourself upon encountering the body?

(A curious practice to be sure, yet not surprising knowing the Undertaker's track record with bodies.)