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I always finish a backward roll by standing up in the same stance that I started in. I do the same with forward rolls as well (On a side note, I don't slap or tap the mat when performing forward rolls or backward rolls). During class (and testing) the instructor will test the students balance and focus by pushing or pulling the student right at the completion of the roll. I've found that the simplest way to perform the roll and maintain proper focus and balance is to not switch my feet while rising back into a hanmi stance. Have a good day!
What I think your asking (maybe not) is do you step 'back' or swing the leg through. We learn both we call one retreating and the other advancing. If someone shoves you backwards and follows you then you can't step forward because there is no room. Also if someone shoves and they stay where they are you can be more 'aggressive' by stepping through, sort of say "hay don't do that." ☺
I often end with shomen uchi ikkyo undo. shomen uchi ikkyo undo reflects a cut, and in a wierd way so does a roll, so I come up on the same foot, and see if my balance is still okay enough to do the exercise.