Opponents' bidding goes like 1S-2S-3S-4S. The opener has 13HCP and responder has 9HCP. They go down 1. Responder can't be blamed if he complained but he did not. I can't believe the opener has the audacity to complain that "P I don't think you have enough to bid 4S". The opener has hundreds of log in and claims to be intermediate.