The Best Effort attack deals normal damage to one foe, but then Thomas becomes unbalanced. There is also a chance that Thomas's sword will get stuck in the ground and when he gets it unstuck there will be a small explosion causing critical damage to the opponent. In it Thomas swings his sword twice and Cecile stabs the opponent with her spear twice, then they repeat the process once more. However if Thomas's sword becomes stuck, Cecile will continue stabbing the opponent up to about eight times before Thomas manages to yank the sword from the ground causing a small explosion and landing on his back.
In Thomas's story it is possible to defeat the Wild Boar boss in one move by critical hitting it with this technique.