Bug Fixes and TDD

Code has bugs. Finding a bug’s hiding place is a challenge. And, you know that killing a bug often breaks code in unexpected ways, hatching more bugs to discover, hunt down, and kill.

If you created your whole code base using TDD, you could prevent many of these new bugs. But you have legacy code; code without tests. How should the professional software Orkinman apply DDT, I mean TDD, to bugs in existing code. (Orkin (r), do i have to do this in a blog?)
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