Don't focus on this aspect. It is best to focus on building your own energy. When I finish exercising or meditating, I visualize putting a sphere of light around me, that is connected to a higher source. It is not intended to be defensive in anyway. More like a field of energy that moves with me as I leave the sacred space I opened up in. A self created healthy space to move around in. An awareness of that surrounding me, and awareness of energy around me. There are as many ways to make protection, or filters around yourself as you can imagine. Fear , or paranoia is the last thing you want to envoke as motivation to create them. Even mild concern can start to go down that path. I think it is best to be open, and surrounded with transformative energy. Trusting your connection and focus. "If" you thought something was going on, causing some negative effect on you, that may be a specific to deal with differently, but, don't go there if it isn't there. Again, focus on building your energy and strenghtening your connection to the master's energy. When Master Lin walks in to a room, you can feel his energy. It sets the "vibration" of its surroundings and anything that enters it.
