Big Mac screamed. He did not hear the front door open. The killer ran towards him, knife out. Big Mac hid under the table, shaking with fear. Ghostface lifted up the tablecloth. Big Mac ran outside, his safe option was to go to the barn. Or he could run to the orchard.

For a horror story, the last three seems too rushed, like mostly the rest of this chapter from there, which, while reading, gave me a vague vision of what is happening and that could easily be fixed by adding more (character's feelings) details or removing the periods replacing by commas that could help in the narrative description.