It's a Trap

“At last, I will have my vengeance! I am certain Matyas will flee again if he sees me first so you will need to confront him on my behalf, friend. Then, while he's distracted, I will engage him. At that point, your obligation as my second is a formality. You must assure Matyas does not dishonor the duel and cheat. When he inevitably does, I expect you'll help me defeat him. He's just through the portcullis there.”