You have a choice. You can sneak past the enemies, escape without a fight - you won't miss anything but EXP and POW you're not expected to get - or you can fight, and even remove the equipment of your enemies to make a later fight a bit easier. Your option. Get to the flag to escape to BF14 unscathed, or move next to an enemy to fight through 13-3. Two items, note that the Sealed Purse is completely useless and only available in 13-2. Lastly, if you're trying to get the MVP bonus, except in the case of teleportating over Baldus, do not open the extensions so you can keep your turn count low.