'Explain it to me again, ' Tobirama murmured from where he was walking just a little too close to Minato 's heels. ' It would have been annoying if the man 's enthusiasm for learning weren 't so stupidly adorable.

'It 's a time-space splinter. ' Minato smiled. 'I exist here in your era but I also exist in the era I was born in. My theory is that when I fell through the crack ' for lack of a better word ' I split time in two and created an alternate reality. A new timeline, if you will. The other timeline is still intact and continuing on just as things were meant to but this one, us right now, my presence here will change this timeline. ' He peeked over his shoulder to see Tobirama hanging on his every word much like Kakashi used to listen to him when he was describing a new jutsu.

'Fascinating, ' the other man rumbled.