member 100 of the blade opening assembly 80 may assist in movement of the blade to the open position in one embodiment to open the blade the knife 10 in a closed position is typically grasped with the back end 24 of the handle oriented toward the operator 39 s wrist and the bottom edge of the handle resting the operator 39 s palm this allows the operator to use their thumb to engage the thumb extension 39 and apply rotational torque to the blade 30 the pressure applied by the operator onto the thumb extension 39 causes the blade to rotate about the pivot pin 28 and exit the blade cavity 26 when an equilibrium position is reached as the blade is lifted out of the blade cavity and the drive surface 35 of the blade rotates about the pivot pin 28 and with respect to the second arm 106 of the actuating member the bias element and the actuating member exert an opening force onto the blade the tension in the bias element 90 acts against the actuating member 100 when a portion of the drive surface 35 of the tang is positioned at a certain critical angle relative to the rotational axis of the blade which in turn forces the actuating member to act against the tang of the blade to cause the blade to quickly move to the open position beyond the equilibrium position the first arm 104 is forced to move in a first rotation direction r 1 due to a force vector applied by the tension applied by the bias element 90 this rotational movement of the actuating member 100 forces a portion.