Oh... where to begin.
Ok first....
"He gets mad, and he stomps down the stairs and stops."
Should be:
"He got mad and stomped down the stairs and stopped." It is "got" instead of "get" because you seem to be trying to write in a past-tense, but mostly going with present-tense. Being foreign, I had a hard time with that past-present stuff... but think of it as this--is the story being told as it develops, or is the story being told as story?
If it's being developed as you go, then your sentence would be correct, but if it's being told as a story, that means the story has already been created or happened, despite what time period the setting is at. For example:
1 - Present, happening as it goes.
Joe walks up to the automatic doors at the Old Paul's, a local market, and thinks to himself whether he should act as he had planned, or forget the idea and go home.
So we're picturing Joe walking up to the doors, then stops to think. Then we read that he is thinking about a plan he had planned, so we're thinking a bit about what he had planned before now, the present.
Now, imagine the story ends here as we know it and the day passed to the day after.
2 - Past, happened already.
Sally tapped Joe on the shoulders. "Whatcha doing?" she said innocently.
Surprised at the sudden attention, he could barely think of what to say, but managed to mutter, "n-n-nothing."
Sally tilted her head to her right and looked up at the boy taller than her, "Really?" she stretched the ending note of her question.
Joe looked at Old Paul's, then at Sally. "Nothing, really." He smiled, "Want to go to the arcade? I bet you can't beat me at air hockey!" He said as he ran for a head start.
"Hey! I can
too beat you!" She chased after him. "You watch, Joey Gard!" She smiled warmly and tried to catch up to him.
Ok, here we revealed a bit more of yesterday that we had missed. What happened later was that Sally sees Joe and asks him what's up and he said nothing (though he was really planning to steal something from the shop... though the story doesn't say that so the audience would try to guess what he was going to do) and changed his mind and thought he'd spend the afternoon playing with his childhood friend and love, Sally.
Get it?
Now, some spelling and punctuation is need here.
Here's my opinion on the story:
I don't like it. In fact, it's kind of a turn off. First off, The Omen is coming out (today, June 06), and it seems like that's where you got the idea. Second off, why must all the bad, supernatural beings be the Devil? And third off, "666" is too commonly used... some have even believed it's a conspiracy because it can be "traced" on credit cards, receipts, and prices...
This is probably the rough-rough...rough and rough... draft. So I'll let the little details (punctuation, spelling) go by, but "dropping" blood instead of "dripping"... well that just drove me a little nuts.
Although I don't like the whole "666" and "Devil" thing, I sure as hell (no pun intended) wouldn't be surprised if you could show me up and still make it a kick-ass story. Keep up the work and surprise me well