I walked down the hallway.

I got a glimpse of something so I ran and I ran as fast as I could trying to get away from whatever was chasing me. 

I knew my dad had special weapons somewhere so I ran and I ran to our old garden shed where a double barrel shotgun was hidden. I found it.

I realised I was being followed by not one but two of them. They have two glowing eyes and this alien-like face. 

I knew this was not from our world because it looked rather out of place. I shot one and missed the other shot.  I brought one down but sadly I forgot the shotgun shells and left them behind. 

So it was all up to me. I grabbed the shovel against the wall and I killed that monster to death, but still  it remains. 

Where did that monster come from, and will more of them come for me again?