This hand occured in a Swiss Pairs event where N/S were playing a 14-16 No Trump in 3rd seat. North chose to open 1 and East with his 14 hcp felt "obliged" to do something and bid 2.
N/S had an agreement that all 2NT bids in competition after a Major suit opening guaranteed at least an Ace and a King with 4 trumps (and at least a raise to the 3 level). Without the Ace and a King, South chose to bid 3 and West quickly jumped to 5 trying to stop N/S's game. North knew what to do. Unlucky !
E/W had already won the auction (and should have had a plus score) when South bid 3H , which should be -1 because of East's good Heart suit. However, the 5X contract went for -300 and NS gained a top with 57.9/58 MPs.
Who was the Culprit? East bidding at the TWO level with :
East is best advised to pass and wait and see if N/S get too high or his partner can either "protect" in some way.
DONT OVERCALL WITH A BAD SUIT.