It’s a weird time of year. People are revving up for Thanksgiving, with an eye to Christmas, but there are still remnants of Halloween tricks (smashed pumpkins, toilet paper, etc.) scattered around the neighborhood.
As an exercise:
Think about what your main character’s idea of a Halloween trick would be? Would he destroy someone’s display, egg their house, or something much worse? Now do it for your villain.
By determining how far your character is willing to go on Halloween, you can determine how they would handle other situations.