Thread: Intense Lucid Nightmare?

Hey all,
I just tried a WILD lucid dream last night and was successful and i was on the boardwalk in my city. I was testing cool attacks on buildings and people that i spawned, i tried and gave myself beast arms and punched buildings, and shot lightning down from the sky. It was like a normal dream, until i looked on the beach and saw a guy in a black short sleeve shirt and dark gray shorts, he was extremely pale and looked like a normal guy. So i decided to try my new attacks on him, i shot a lightning bolt at him and nothing happened, so i jumped off the boardwalk, gave myself beast arms and in one jump i got to him and punched him, nothing happened, so then the man grabbed my arms and slowly began to rip them off, he had me for at least a minute before he finally ripped them both off. I jumped up as high as i could now that he had no hold on me, i tried to repair my arms but i couldn't get them back, when i landed on the beach the man grabbed a hold of me again, but this time he started to crush my head with his hand, the hand was freezing, he had me like that for quite some time, then i shook him loose and tried to wiggle away, the dream ended with him shooting a light beam at me, i woke up before i got hit.

I was wondering if having a nightmare this vivid i common for lucid dreaming. (i am relatively new at it)
And i heard from a friend that it could be someone who entered my dream, can that really happen?