That fight is in every instance of Emridy Meadows I have gone in there. It's just one of the encounters that always happens in that particular area. I tend not to bother with that area until my mage has 3rd level spells or I am feeling lucky. You need very good rolls to beat those two without being 5th level or higher in a party of 5-6 people.
I have a crazy, impossible fight for you. I knocked out the two traders and their hireling guard in Homlett with a 5 person party of 1st level characters. I should have leveled at least 2-3 levels each character. Did I? No. I ended with a crapload of magical items and leveling once. BAH. That was an insane fight too.
I won it by sticking the last guy with my necromancer's dagger with all of my other PC's dying on the ground.
