Arrogant Challenge

When I was young and full of energy, I used to be a bounty hunter. Now I'm completely retired, but someone must have remembered me from back then. I heard a rude stranger posted a Letter of Challenge to me on a rock in Low Wind Village. Whoever he is, he's a coward. He wasn't brave enough to come to me directly, just left a document in town. Anyway, I won't give him the satisfaction of seeing me retrieve the Letter of Challenge myself. Please represent me and bring back the Letter of Challenge instead.

It's not hard. Go to Low Wind Village and bring back the Letter of Challenge posted on a rock.

Hmm, let's see. It's been a long time since I saw one of these. How dare he! He must be quite an evil fellow! He didn't even sign his name, but he says my family will be in danger if I don't agree to this challenge. It's an empty threat, but quite insulting. Hmm, what should I do with him? Wait. I need to think.