Furinkazan literally means: Wind, forest, fire, mountain. "Move as swift as a wind, stay as silent as forest, attack as fierce as fire, undefeatable defense like a mountain." The original phrase in the Art of War is however a bit different. And I may be mistaken but as far as I remember women were actually never mentioned in it.|
The woman on the last panel is taken from Japanese mythology: Yuki-onna, meaning snow woman. She's extremely beautiful and seducing, but that's also where her cruelty lies. She kills her victims, like lost travelers, with her icy breath. In this case however her charming beauty caused the opposite and saved the warrior from jumping by, well, freezing his movement. Just that this freezing was ironically not literal. And that ironically our warrior is finally immovable like a mountain, as he should have been during the war.