I only encountered it once, in what was a fairly lightweight form.
As I was falling asleep one night I had an intuition, you might call it a vision, though it wasn't really involving sight, that someone I had encountered, together with another person unfamiliar to me, were attempting some sort of magic directed against me. I was by no means expert or familiar with that area. However, I mentally invoked a protective sphere around myself, with the intention that whatever it was would bounce off harmlessly. I definitely did not want it to recoil so as to affect anyone else, not even those responsible. It seemed to be a one-off occurrence, I slept well and did not have any further awareness of the issue.