Hi guys, In a uncontested auction, the bidding went 1♠-1♥-2♥-4N-5♠-Pass. Basically, I realized my 4N had been optimistic and 6♥ is not making as we have not enough keycards. I cannot even get to 5♥. I decide to pass figuring this limits the damage, ie, 5♠ loses fewer tricks than 6♥. If opponents had doubled then I am retreating to 5N which partner would realize was not a King Ask. Partner and I had no agreement in this situation. What do you suggest as a way of parachuting out of RKB when you know a small slam is not making?