Sometime in the last 5 years or so (I think) I saw trailers to an upcoming kung fu or martial arts movie, set in more modern day style as I recall, but with scenes where people with swords fighting were sliding through what looked like inch-thick blood on the floors.  I remember seeing them in slow motion, running through all this blood, then dropping to their knees and sliding through it.  Appreciate any suggestions as to what this might have been?  Thanks in advance.