Menstruation present at dawn prevents a valid fast from commencing. Travel, by contrast, is a concession and does not itself nullify a fast; a traveller can validly keep fasting.
Thus the same statement about abstention for the rest of the day does not imply that each person’s earlier-day fasting status was the same.
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Kitab al-Sawm: Unconsciousness, Recovery, Menstruation and Abstention
Menstruation present at dawn prevents a valid fast from commencing. Travel, by contrast, is a concession and does not itself nullify a fast; a traveller can validly keep fasting.
Thus the same statement about abstention for the rest of the day does not imply that each person’s earlier-day fasting status was the same.