A Sorcerous Defence Against Malevolent Spirits, discussion on sorcerous self defence Options

ok, so I became intrigued by another post and have been unable to shake the idea of starting this thread mainly because I wish to see what others believe would be a good defence against malevolent spirits should you find yourself being thrown in a position that rituals are unable to be performed.

I know it's a bit uncommon, but what about ways to defend against spirits or demons without preparation? Like for instance, walking down the street at night and having something less-than-friendly catch your attention, or something. No herbs, no seals, no big ritual spaces or tools; just your own power and maybe a few magical odds and ends you may have on your person if you swing that way, like a crystal or an amulet or something. Basically is there a good way anyone knows of to banish or defend against spirits outside your home playing field on the spur of the moment. Any input appreciated, thanks:)