He hands over a weapon / lets you trade only on Thorus's (or Gomez's) authority; you have to invoke that order before he gives you gear ("Thorus sent me. He said you'd give me a weapon?").
Old Camp armory — Chapter 1: Keeper of the camp's weapons who also trades gear.
Items Skip sells in Gothic 1 Remake.
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0You: What are you doing here?
Skip: I'm in charge of the armory.
You: Do you sell those weapons?
Skip: Only to our men.
You: Got it. See you around.
You: Gomez's orders.
Skip: ... No, I don't buy it. Now piss off before I lose my patience.
You: Thorus sent me. He said you'd give me a weapon?
Skip: Did he?
You: Go ask him.
Skip: You know what, I might just do that. I'm sure he'd love to know there's some guy bringing up his name.
Skip: I have no idea how you got in here, but if I were you, I'd piss off as fast as I could.
You: He also told me to kick your ass if you act stubborn.
Skip: Oh, did he now? I have a feeling I'll be the one doing the ass kicking if you don't get out of my sight right fucking now.
You: He did. And he also told me to kick your ass if you keep holding me up with all these questions.
Skip: All right, all right - calm down. What do you want?
You: He wants me to take care of something that only I can do, if you get my meaning.
Skip: And so he sent you to see me?
You: I could use a few things.
You: About that gear ...
Skip: Get lost!
Skip: Hey, you've come a long way, haven't you? Especially as someone who just got here.