As far as I know, Kiwi doesn't provide any sort of -unstub
API call, so, I don't know of any way to do this. But playing hopscotch and having something stubbed briefly and then unstubbing it will lead to tests that are hard to read and maintain. What I would recommend instead is to have separate context
blocks, one in which audio is enabled, and one in which it is disabled. The latter context
block would have the method stubbed.
Another option would be to stub in a more granular fashion, based on what arguments are being submitted to the method. As you can imagine, it's a completely different dimension in which to stub than stubbing in terms of time, as you have in your example.