Theory; They are supposed to dissapear after a single hit... since Flurry gives more than 1 hit however, and they dissapear after the first, the game crashes on the player.

https://www.dropbox.com/s/pxbjz747n7qejl8/DOS%20Reproducable%20Crash%20savegame%20and%20logs.rar

Contains;
* Savegame allowing you to immediately flurry one of the Shadows.
* 2 crash logs. One from when I experienced it, and the other from trying to (successfully) reproduce it.

Let me know if anything else (like specs) is needed, but it seems unlikely that this is system-dependant, especially if the theory's correct smile