Even if it's a camp fight, the geography means there's only one path (Unless I'm wrong.) and it's limited enough that at worse, even though Gringor will hate it, he can run away and can't get flank.

Gringor was built for dueling and fighting against groups of mobs. So this is his field.

I initially thought of sneaking but that's honestly not going to work. 

Granted, I prob should have Gringor waited till its night time for the duel but what done is done.