Geisha vs ninja

The plot is simple enough. But being an avid fan of ninjas and samurai, I noticed too many mistakes in there.

1. a female geisha would not remove her clogs to fight because there may be spikes on the ground.

2. ninjas are not known to use katana because they are too long and become less effective in enclosed space. They usually carry a straight shorter blade call a ninjato.

3. the bamboo blade the geisha was carrying isn't usually as thick or long as a katana. They are mostly used as a concealed weapon, thus length and width are limited.

4. why did the female ninja keep pulling her mask off and putting it back on during the fight? The purpose of the mask is to minimize the exposed area that a light can shine on during an ambush or night op.

The fighting is stylized and anime-like. It feels a bit weird at times, especially when the geisha was fighting with the monk.

Oh... and the actress did not walk like a geisha. Totally unconvincing.