To understand what is Repulsion, let us understand what happens with a Magnet: a magnet is an object which is capable of producing a magnetic field. A magnet works by attracting the opposite poles but it repels the same poles. The pressure which you feel while trying to connect the same poles of a magnet is called repulsion.
When you send energy through VK to a receiver, first the receiver will receive energy as per need then there comes a point when there is no need for energy anymore.
When this state comes then you might feel repulsion from the receiver as a hint to stop sending energy any more. If you are sensitive to energy, you may feel this repulsion. You may not feel this repulsion sometimes if you are not so sensitive to sense the energies.
With the regular practice of VK, many VK users have felt this repulsion. Even if you do not feel this repulsion, it is ok. VK is always working on your intentions.