Was Harrison hallucinating, or did it really happen?

Question

In Dexter: New Blood episode 05 "Runaway", Harrison consumes ecstasy during a party and is shown to get intoxicated and get blurred vision. One of the girls at the party asks Harrison to carve his initials into her foot, but once Harrison starts carving, she starts to panic. Her friend seems to suddenly be alerted and tends to the girl quickly. Meanwhile, Harrison dozes off from the scene.

Since Harrison experiences this while he's on drugs, it's hard to figure out if it really happened or not. For example, asking someone to carve their initials on their body using a kitchen knife seems over-the-top, and the way the atmosphere suddenly changes once Harrison carves the first line on her leg and the girl starts panicking, makes it look like a hallucination that Harrison experiences, since he has a connection to blood like his father. It also seems weird since no one of the students at the party mentions this incident later in the episode.

Answer 1

I assume you are asking if the girl really asked him to carve into her leg or if he hallucinated that part?

With the information we have there are basically two possibilities of it not being real.

1. She didn't ask him to do it and he hallucinated it
2. None of it happened at all, including the cutting

It's unlikely that Harrison would not have had any consequences to cutting a girl that didn't ask for him to cut her, so I think we can easily rule out the first one. So either the whole thing was hallucinated including the aftermath, or it was all real.