The people who aren't watching a bearing at the difficult or heavy moments of the life become power vampires.
These are people at whom gradual blackout in middle structures of a brain develops.
If to show observation, for example on the street, it is possible to notice how vampires allocate long before the donor from other pedestrians and gradually, changing the movement direction, try to be crossed with them on counter courses, to create a jam and to concern him to take his strong power to themselves.
And if still, in this short moment and to manage to anger the donor that he would flare up, or to look to him in eyes, the mood of the vampire is for a long time counterbalanced.
As soon as it was made, people at once change the states and moods - at the vampire the mood is lightened, and at the donor it falls.