So the 2 hits you get can't be modified. This might sound stupid but can the defender dive cancel them.

Yes, cancelling isn't modifying, certain cards prevent cancelling certain results (such as autoblaster and ten numb), but modifiying is different, they even take place during different phases

1. Adding results.

2. Changing results.

3. Rerolling dice.

If it's not on that list, it isn't a modification. It doesn't matter when those three things happen, they are modifications.