Blindside is an ability in Star Ocean: The Last Hope that allows a character to move behind an attacking enemy and surprise them. Blindsides are triggered by pressing and holding the jump command while the player character is targeted. If the character moves away too soon, the enemy will anticipate the blindside and counterattack. If a Blindside is attempted while too far away, the enemy will simply be deterred. It is possible to double blindside with a BEAT: Strike level of 9 or greater, avoiding counters.
Successful blindsides result in an "!?" icon above the inflicted enemy. All attacks while in this status will be critical.