It is part of the game to open a little light in 3rd seat. The Drury convention is an attempt to cater for that when supporting partner with a passed hand.
Opposite a 3rd/4th seat opening in a Major a 2♣ response is artificial showing a constructive raise of openers suit (i.e. 1♥,3♥ type of support). Opener re-bids 2♦ with a minimum hand or one that would not consider game. Responder then signs off in two of the Major. Any other bid by opener is natural and shows a sound opening, with interest in game.
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