Unescapable Battles Glitch
From Final Fantasy Wiki
Glitch in Action:
The Unescapable Battles Glitch is a glitch in Final Fantasy VII which refers to the player being unable to escape any random encounters in certain areas of the game after a boss fight. This glitch arises from the fact that the flag for "unescapable" is not yet turned off until the player leaves the screen, resulting in all random encounters unescapable after the boss is already dead. There are three areas in the game that this occurs: 59th Floor of Shinra HQ during the first raid, after killing the three Mighty Grunts, Gaea's Cliff, in the area after the player kills Schizo, and in the subway tunnel in Midgar on Disc 2, after beating the Turks.
