Originally Posted by UzumakiUchiha
From what I remember, kakashi transported diedara and his arm in to another location where diedara already retrieved it. From the new chapter, I think kakashi understands his kamui technique a bit more and how it works. Probably, when he uses his kamui, he transports the object through a dimension with no time/space like a void, then the object instantly reappears in another location from that void as the void has no time flow.
So I would say kakashi transported the rasengan to the void dimension and back to the same space as it seems like he has more control of it.
no the only thing that happened was that Deidara lost his arm he was never transported to the dimension. Plus Kakashi isn't retrieving the rasengan . Tobi just warped to the other sidwe where it was and got hit.