In the usual situation, South opens one spade, West doubles for takeout, and North passes. If East wants to "convert" the double, they need a very strong trump holding, in fact one that is likely stronger than South's since East is sitting in front of the declarer.
But here, with nobody vulnerable at matchpoints, North deals and opens one spade. East passes with the following: ♠ QT987 ♡ 82 ♢ AK5 ♣ K76.
South passes, and West "balances" with a takeout double, showing about 11 high card points and shortness in spades.
Can East now pass for penalties sitting behind North? (I would not do this if West doubled South whom I would be setting in front, of as declarer.) Or could it be that the principle regarding needing a weaker holding in this position is right, but the trump holding is still too weak to "convert"?