So in this game when you die, sometimes a nearby enemy takes your blood echoes inside it and you have to kill that enemy to get your echoes back. However I was under the impression that if you die after losing your echoes, those echoes are gone for good even if they're in an enemy.......that doesn't seem to actually be the case and here's the proof if you'll give a little watch. The moment happens at 6:45 and if you keep listening, Pat says "I was wondering why his eyes were still glowing." They had died already after that enemy had the echoes but then they came back to fight it and they were still there......Am I the only one who had no idea this happened?

They got killed by this guy in part 2, but as far as I know they haven't died since. So I think they were just surprised that when they returned and killed him after all that time that he still had their souls.