I have to tell this story, as it relates to the scream. One time I came home from work late at night. All the house lights were off, and I assumed my husband was asleep. My nerves were on edge, because at work, I had gone outside to put something in the external refrigerator behind the business, and a man was just standing out there. I was alone, and it really spooked me. I ran back in the business and locked the back door.
So when I got home, all the lights were out, and I assumed my husband was already in bed sleeping. I opened the front door and entered, and he (my husband) jumped out and grabbed me. I let out a series of blood-curdling screams and dropped to my knees in tears. Then he felt horrible, as it was just done jokingly! Bad idea, but he meant no harm.
The point is, when you are a girl, and a guy jumps out who is 8 inches taller and a hundred pounds heavier, I think the natural reaction is to scream! That is why I think Holly was surprised, and I don't think he probably came up from behind and put his hand over her mouth. I think he either jumped out and scared her-- from the shadows of the garage or the car! He could have grabbed her around the waist. I wonder though, if he didn't come from the front, and when she screamed, his reaction was to punch her--to put her down quickly--so the screaming would stop!
There is no telling how it went down, but I had to relate my gut reaction to being startled from the front!
JMHO