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When the ninth of Av is on Shabbat, the fast is postponed to Saturday night and Sunday. That Shabbat, we show no signs of mourning. Rather, we eat and drink as on any other Shabbat. However, once the sun sets and Shabbat is almost over, we stop eating and drinking.
Since the fast is already in effect when Shabbat ends, Havdala cannot be made over wine. Nevertheless, in order to permit melakha, we recite “Blessed is the One Who distinguishes between sacred and mundane.” Additionally, we recite the blessing over the candle on Saturday night, as this is independent of the wine. It is an acknowledgement of Adam having learned on Saturday night how to start a fire (26:24 above). On Sunday night when the fast ends, we recite the rest of Havdala. It includes the two blessings of Ha-gefen over wine and Ha-mavdil (though with no fragrance or candle). We may only break the fast after Havdala.
If a sick person needs to eat on Tisha Be-Av, he must recite Havdala first. Ideally, he should use grape juice rather than wine, as grape juice does not cheer people up (23:11 above). A minor eating on the fast does not need to recite Havdala before eating.
