There absolutely no way Tobi is going to get hit or even injured. I'd think this will the time we find out Tobi is not exactly who he appears to be (not necessarily Obito but that's still a possibility). Tobi is going to save Sasuke and Sasuke is going to be like "who ARE you?!?". Either that or Sasuke finds himself alone wondering how he somehow managed to escape the blast. It will be inferred that Tobi saved him even if Tobi is either nowhere to be found or appears for a few panels, says some hinting words to Sasuke, and mysteriously takes his leave.