would you like to share capx? or at least give us a picture of what you want to do?
is the enemy moving ??
if the enemy is not moving , try to do this :
event1:condition1: player :collision with enemy
condition2:system :compare two value :player.y<enemy.y
action1: enemy movable
action2: start fade
also put physics,and fade as behaviors on the enemy to do this.