If you ever feel negative energy.. or feel that there is a chance that you will, envisioning white protective light around you is one of the best defenses.
Now.. if you wish to go a step further.. you can so do a binding ritual.. which will actually *bind* that person from causing you or your group any harm.
you can simply bind the source of the negative energy.
Now again, the most important thing here is visualization, but by using tools or focus points, it helps u to focus your energy on the desired affect.
So.. you just basically write on a piece of paper what you feel the problem to be.
Not WHO.. but WHAT
Have 2 black candles lit.
It is also good to burn a binding incense.. which sandalwood
or frankincense or basil can be used.
Even the herb basil can be used, sprinkled on the candles flame.
Then visualize the problem ceasing.
Look into the flame and see the effect that you desire already
occurring before your eyes.
Then burn the paper over the left candle's flame.
Visualize your problem turning to ashes as the paper does.
You can even say something if u wish as the paper burns.
Positive.. prevail it must. Watch the negative turn to dust.
you can also add a prayer.
