How does power guard work exactly?

That has happened to my hero as well, and it always bugged me because I would literally spam pots and still die even though I had 30k hp. I cannot remember the exact circumstances when it happened though(it hasn't happend to me for a long time) like if i died right when it kbed me to the other side or as i was walking back. But one thing I am positive about is that I was never 1hit koed while I was being seduced. That could be coincidental though because I remember there were times when the tail did not 1hit ko me while i was blown to the other side. The problem seemed to go away though ever since I bought auto pot, but then again that too could be coincidental also because I've been too afraid to go on the tail and test that out since it would waste a res lol