Once the mist descended upon them, Shinobu realized that the girl meant business. He tightens his grip around his sword and waits for her next strike. Even though Yuffie might be able to mask her movements with this technique against normal opponents, Shinobu can literally hear everything. He's half-vampire after all and very much capable of hearing even the most minuet whispers.

From the right...!

Shinobu instinctively swings his sword to parry against her dagger. He takes this moment to try and dominate this fight by pushing Yuffie back forcefully with a horizontal strike. He doesn't doubt that Yuffie can handle herself well enough not to be impaled.