GrahamJson, on 2018-August-18, 05:50, said:
Equally if you take away the heart ace from west’s hand he will still have a 2C bid but 5C stands no chance whilst 4S needs just a trump break. Perhaps after the sequence 1S - 2C - 4C a bid of 4S should be non forcing.
And he bids 4♠, of course it's NF