A surprise attack by Erec and his men with their new super weapons leave Kon and crew running for their lives.  In the aftermath, each group is left with a prisoner of war to “interrogate”.
the enemy sneaking up on you.
de que el enemigo te 
sorprenda por la espalda.
de que el enemigo te 
sorprenda por la espalda.
do inimigo te pegar de surpresa.