It was in the heat of the moment that it happened. It really wasn't his fault. Really.
Obito had always been an impulsive person, and the fact that he was now an eleven year old chunin in the midst of a war wasn't going to change that overnight.
So when his sensei brought back an unknown scroll to look over with Kushina and the team, he didn't think before shoving a third of his chakra into it.
The thing glowed then flashed and everyone was enveloped by a white light and he could distantly hear Kakashi yelling expletives and insults in his general direction. He grinned, then remembered the situation at hand.
He found himself alone, floating through a grayscale static before being unceremoniously dumped with the rest of Team Minato (plus one) on a training ground that was absolutely destroyed. He couldn't help but feel a tiny bit guilty.
On the other hand, though, the scroll did something, and he found himself elated at the thought of what actually just happened until he caught sight of a person who looked just like their sensei, and a person who looked just like his own teammate, but older.
An unbidden, boiling rage bubbled up his throat as he saw the teammate lookalike's face, and the scar that stretched over one eye and the scarlet that almost glowed beneath it.
Then, the rage died down into horror as he realized what this must mean, because if this was the future or something, he most certainly was not in it.