Zaruvza - Tuesday, June 21st, 2011 - 7:36 PM
I agree with sacredcow, try to keep yourself in a positive frame of mind. That's helped with my experiences. May not be enough to help whoever you're with if they lose it though. Be positive, stern, in control. Fear is the biggest window of opportunity for negativity.
You may wanna look into a basic banishing ritual if you wanna have a more... mechanical fallback. Like the Lesser Banishing Ritual of the Pentagram. It's worked for me before.