Are there subjective experiences other than one's own? And if so, where are these subjective experiences located?

On a regular basis I assume that other people have subjective experiences. By that I mean I believe that if I punch someone in the fact then there is another conscious being who is undergoing a subjective experience of having a fist fly into their face along with the experience of feeling pain. But how can I justify this belief of mine? Where exactly is this subjective experience that I assume other people - the person i'm punching - has?

One might propose that this subjective experience of feeling pain is literally inside this person's body, perhaps their head somewhere? But this view seems rather problematic, since no amount of a neuroscience reveals the existence of subjective experiences inside of human heads. Plus even if it were accepted that subjective experiences exist inside human heads it would then leave me at a loss to understand how my own experiences are located inside of a head, while at the same time appearing outside of my head. My subjective experience of my laptop would be inside of a head, but it appears outside and in front of my head, which makes no sense.

But if the subjective experiences of the person I'm punching are not located inside of a human body then where are they? Now one might propose that these subjective experiences exist transcendentally to their body in a dualist sense. But then this raises the question about how can something that exists transcendentally - the persons' subjective experience - causally influence that does not exist transcendentally - the body I am punching.

Does their subjective feeling of pain cause their body to recoil? If so then how could this type of causal interaction work?

Or one might propose that the person I'm punching has no subjective experiences at all.