You're not playing 2/1, but South forces to game with 2S on the second round. West leads the HA.
1) HA, 3, 6, 9
2) HK, 4, J, Q
3) D2, K, A, 3
4) C2
Opps are average players, so I wouldn't read too much into their signalling. It's likely the H6 is rev attitude and the HJ is suit pref for diamonds (hence the diamond switch). Which club do you play at trick 4? What's your plan?
ahydra