True, but there maybe other factors that will contribute to Clare and Galatea's possible escape. Such as the posibility of Jean helping them sacrificing herself in the process(whether AB mode or back to clamore mode), Riful lets them off wanting to be "cool" or she will be bored, caught Riful off guard that would lead to their escape and lastly, miraculously, they beat duff and was able to escape.

don't you know the possibilities for the main character in an anime?