The Gruesome Game Of The Gator Ghoul - S1-E2
Plot hole: It's revealed Ms Dovely used flashlight batteries to make the eyes of her mask glow. What's not explained is how she turned them on without needing to stop and turn them on as demonstrated by Fred.
Answer: It was his own personal man cave, he was born and raised there. It was the only place he felt safe and secure. In just about every "Halloween" film he always returned to his home. It belonged to him. I personally believe Karen went there to get a feel for the place, trying to make sense of everything. Why does a normal kid turn into a ruthless killing machine, was it just him or was it the house itself.