I might be being dense.
Someone enters the industry at the first stage of the deal ahd the property in question is something entered at the Closed Lost stage, so i basically would not want the rep to enter Industry A, B, or, C and then be required at the first deal stage to fill out a Closed Lost-specific field.
But when they get to Closed Lost, I want the field in question to only be required for Industry A, B, C. My understanding is the way conditional property logic works is it prompts the dependent field immediately after the first field is filled in.