Swamped

You try to get a better sense of what they're doing. Their pose is a little bit odd, they're a little hunched over...

Oh, wait. They're just relieving themselves. The swamp's too dangerous to do that outdoors without a lookout, so you'd forgotten what it looked like for someone on their own.

Well. Probably best to just leave, then. Rider isn't here, and while you're curious as to this person's presence, you don't see an urgent reason to investigate...

"Don't move."

The stranger is suddenly holding a crossbow behind their back, and has it pointed directly at you. They still seem to be going about their business, though.

"I didn't see anything," you protest.

"I said, don't move!"

You awkwardly sit in silence for a minute or so while the stranger finishes up. They turn around, keeping the crossbow pointed at you the whole time.

"I don't know how a Marshguard winds up in the desert, but I do know you've almost all got bounties on you," they continue. "So come along quietly, and I won't have to hurt you too much before we go and check on yours."

Well. This isn't what you were expecting at all. Now what?