As both of you work through your training, you become aware of the darkness within you. It is not part of you, but something external. Now that you are aware of it, it is constantly in the back of your mind. Like a sore tooth, your thoughts keep poking at it.
As Ch'alana feared, the darkness in his spirit has spread to you through your connection. As long as you train with him, it will be a factor in your lives. You do not have dark side points, and still get warnings before getting them, but because of Ch'lana's unintended influence, you will both be faced with constantly needing to resist the dark side. This will require a constant mental effort.
This will have the effect of always taking an action. As long as you train with him, and wish to resist the dark side, you will have to have an expended action to keep "up" your resistance.
This situation will exists as long as you train with Ch'lana and as long as he has dark side points.