The Law supports a pass. Yes, but so does bridge logic, and I didn't even need to make any adjustments. I want to add that it's basically impossible to come up with a hand for partner where we want to be in 3♠ (that is, just from looking at partner's hand, we are probably making 3♠ and they are probably making 3♦). I am also willing to bet that the double dummy total number of tricks is less than 16, but this depends a little on what you think a 2♦ or 3♦ bid is. On top of this, it is practically a puzzle to even construct layouts where both 3♠ and 3♦ are making.