Evade & Counter doesn't guarantee that the character will evade the attack, it just raises their evade when they get physically attacked. If the fiend has a high enough agility and accuracy you'll still be hit. The same with Counterattack, if evade is high enough then the attack will fail, but that character will still have been attacked, so the Counterattack will take place. And Magic Counter just counterattacks when the character is hit by a spell.