The explanation of Peach Blossom Killing in the Three Kingdoms is that it is used by all characters in the stage of playing cards. Settle in the order of action ~ target character recovers 1 physical strength.

Everyone uses it, whether it is full of blood or not.

The hero's explanation is to restore a drop of blood to every character with insufficient blood on the field.

It's for characters with less blood, so the recuperation of heroic killing can't be used when all characters are full of blood.