[toastlots]

Sorry, I do not know how to save a hand details, but this was a 10 minute robot sprint, tournament number 22080-1775988901, 4th hand.
Ops opened 1D, I doubled to show some points, ops then bid 1H, my partner bid 1S, ops raised to 2H, I passed as i only had 2 very low spades so could not support my partner's 1S bid.
Ops then went 3H and my partner bid 4S (with 8 face card points and just 4 spades, we were doubled and of course went down a load, 1700 point.
Was my double wrong and should I have just passed?
What made the GIb think he was ever going to make 4S, or was he expecting me to go 5 something?
I seriously want to learn how Gibs bid, but found this baffling.