Pawn Roller for a Piece

In the following chess position  reached  via a King's Indian Defense, White's Knight at b5 has just been attacked by a pawn pushed to a6. Note that Black's weak d6 pawn can not be captured as it is guarded by the Queen and the e8 Knight.

So what to do with the harried horse? Retreating to c3 would be the natural option in this fight or flight situation. I will give you a hint. Pawn duos(two pawns side by side) increase in strength depending on how far advanced they are. For example a pawn duo on the fifth rank can be strong, but not as potent as a duo on the sixth rank.

I think Hans Kmoch might consider this position worthy of inclusion in his book titled Pawn Power where he develops an unnecessarily cumbersome lexicon of terminology with terms like sealer, sweeper, melanpenia, etc.