Well, I'll try to make this brief. for one, everyone is saying that Kakashi can use both the ability to transport himself and other things to the other dimension, because of how he teleported himself back when Obito brought him there.
Personally, i believe that the only reason Kakashi could perform such a thing is because he was in "his dimension" therefore he controls what goes on there. this could be wrong, its just my opinion.
Also, this is more of a "what if?" kind of thing, if Kakashi looked through glass and used Kamui, what would happen? would it send away the glass, the person behind it, or both?
Personally, i believe that the only reason Kakashi could perform such a thing is because he was in "his dimension" therefore he controls what goes on there. this could be wrong, its just my opinion.
Also, this is more of a "what if?" kind of thing, if Kakashi looked through glass and used Kamui, what would happen? would it send away the glass, the person behind it, or both?