So, I have been playing Chained Echoes for about 12 hours now and the one hit kill thing has been working perfectly until now. I am now in the part of the game where I have regained the sky armors and I just ran into an enemy in which the one hit kill thing is not working at all. I don't understand why one hit kill is not working on this enemy when it has worked perfectly on every single enemy I have encountered thus far.
Never mind. Apparently, there is some kinda gimmick that is needed to defeat this particular enemy that I have not unlocked yet as it is part of a side quest that is not available until the very end of the game.