Sorry, I don't understand. You don't allow the second aircraft to continue the approach even if the first one is in sight?? I'm talking as twr atcer, which has received two landing aircraft under separeted by the app, and the second one is maintaining the first one in sight and able to continue the approach. If you want to avoid the m.a. for the second one, what do yo do?? You give land after or not ?? And if you use land after, but you have visibility under 5 km or tail wind more than 5 kts, you'll give anyway land after ??