It really had. See what happens when you leave the village for practically years at a time? You forget how to practice with your favorite Uchiha, that's what. Obito was fast, but not fast enough to fully evade the blast. Instead he let himself slip through branches until he could grab one to drop to the ground properly. He'd have to restart the tracking process, and a quick scan had him pausing though as he looked into the training field. Cute.

But not quite good enough. She clearly didn't expect him to have cheated from the start too. Thus, while scanning for Kushina proper, just in case, he circled around to see what the fake Rin was trying to do, ready to slap a tag on her.