The advantage is almost always with the Creep Jacker. Such incidents have the possibility of causing you to lose the game if you're not careful. It's important that players know how to deal with Creep Jacking to play effectively. The game play often goes through phases where players are attacking each other, then going back to the Creeps, and back again. This strategy is seen very often in play whether by accident or on purpose.
Creep Jacking is attacking the enemy player while they are trying to Creep (attack the Creeps).