Half a step will leave you weak when shoes are made from problems passed
Past problems rumble, what's the jungle but a lions grass?
Clever play on imagery asserting that old problems will come back to hurt you in the end. The shoes represent a burden of something important one has left unsolved coming back to creep up on them. Trying to walk in very old or worn down shoes, could actually have a bad affect on your feet.
He could also be playing on the coined BDK term “ain’t no half-steppin'” fronting or acting fake when bad situations rise up (rumble) again.
He’s playing on the name of the famous boxing event between Muhammad Ali and George Foreman, Rumble in the Jungle withthe literal. Essentially, the lion is king of his domain and the jungle is a small territory to him like grass (ie. a yard) to a human. In other words a little that past problem is small and can easily be fixed.
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