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If you want my opinion, I wouldn't let him go without an escort. Of course, there's no real reason to detain him now, deceiving him and sending him in another direction would be pointless, and telling him to go somewhere would be a clear neglect of our duty as patrols, considering his appearance. An escort would be the best option.
And, of course, it wouldn't hurt to clarify who he is.
Also, if we part ways peacefully, it would be logical to offer our help with his treatment.