I cannot give a guarantee... but I do not think that it will be too damaging. It would only be a small part of me, after all. Likely I would only feel weaker. It is not something that rest would not correct.

I will thank you for your assistance, however. Though you do not require payment, I would still like to offer something in return, should you think of anything.

[Though perhaps he shouldn't speak so soon since they hadn't actually succeeded yet. Still, he always liked to repay favours if he could.]