Board Thread:Questions and Answers/@comment-2107156-20171112120432/@comment-24922135-20171112182407

It was explicitly shown that the Time Bomb only erases time from that point forwards (hence how Ben and Paradox could go back to build an army). Speculation: This is an anti-paradox (the logic type, not the character) device to prevent the user from being erased. Alternatively, the Time Bomb may have extra functions designed to protect its user.