Taking off impossibly fast

I guess most people have had a Grim Reaper dream at some point in their life, here is mine (my scariest LD ever): In this dream I was at my log cabin doing chores (as usual). I walked into the living room, which has a high vaulted ceiling, and I could see somebody in a dark hood robe, up-side-down, with their face against the wall, and about half way up. I found this very alarming, and I instantly became lucid. The clarity was perfect and everything was vivid. The dream figure then crawled head first quickly down the wall, across the floor, and then it stood up one foot in front of my face. He was slightly taller than I, and it was the Grim Reaper! I was totally freaked out! He had icy, bluish gray eyes, which seemed to be glowing, and a lizard face. His scales and coloring were actually quite brilliant and beautiful as far as a lizard goes (I thought). The first thing that came to mind was, "Kill him!" This was not a normal response for me in any form, especially while lucid. I reached forward and tore his black, hooded robe off and threw it to the floor. This genderless, lizard biped was standing there completely naked with a shocked look of fear on his face! His mouth dropped open and his eyes bulged wide. He looked totally weak and anorexic. I thought to myself, I am going to destroy you. In complete rage, I reached forward to crush him, but he shot off in faint wisp of smoke right through the log wall and was gone. He was unbelievably fast. I immediately woke up, and I was shaken by the dream. This was no doubt the scariest lucid dream I have ever had. I saw this dream figure once again in an LD last year, but I left him alone and ignored him, and he kept his distance.