If you cant fight, just run. Occasionally there will always 1 or 2 enemies will follow you and you should able take them down without much problem. Fully recover and approach the horde again and you shouldnt have much problem with them. Or just go do some remaining side quests for experience to boost your level. Once you engage in the battle with Laiken, all your current unfinished side quests in broken valley and sentinel island will be unaccessible.
