During battles, while an enemy is attacking, the player has an option of defending. The player can defend with all characters using the All Guard command or just defend with one character using that characters corresponding Battle Button.
However, there doesn't seem to be any information that I can find relating to why someone would defend with a single character instead of just defending with all. The player can't seem to attack while enemies are attacking, nor does it seem to provide the player with any noticeable defense boosts. Maybe I'm missing something though.
So, is there any benefit to blocking with a singular character rather than just all characters?