Knowing the druids habits, i'm guessing briars are below. If you force someone to flee under the huntress with fantasia, there's a lot of chaos in running around that maze while someone spams thorns/sunray/moonbeam/and/or vibrato while not knowing direction you flee or run because of fantasia. Getting briar lag gives the outlanders time to run down and attack before you get to make an escape attempt at potions. So long as potions are available, escape might be simple.
However, if you fantasia AND force them to flee with nocturn of fright, that's how you can really confuse their movements if you're lucky.
That is what I would try to do at least. Songs dont land easily first sing, and that lags the bard a good bit so it's not exactly reliable. But if have a competent chase partner like the druid, well, then it's easy frags.