Ruling on interrupting tawaf to break the fast and pray

Question:
A man in Ramadan was performing tawaf around the House. After he completed the third lap, the adhan for Maghrib was called. He stopped, broke his fast, and prayed Maghrib. Then he returned and completed the remaining four laps. Is this valid?

Answer:
If it was voluntary, the matter is broad. If it was voluntary, he is not required to repeat it.
Q: Tawaf of 'Umrah, tawaf of arrival?
The Shaykh: No, he is required to repeat the tawaf. As for sa'y, if he repeats it, that is good; otherwise, it is not required to repeat it according to the correct view. However, he is required to repeat the tawaf because he ate. It is permissible for him to separate it by praying with the people or attending a funeral.
Q: But if he broke the fast with the intention, his intention being that he would break it?
The Shaykh: If he did not eat or drink?
Q: Yes, meaning he does not miss the reward?
The Shaykh: It is a matter of consideration; because the intention to invalidate the prayer invalidates it, and that is the correct view. So the closest view—Allah knows best—is that it resembles that, if he intended to invalidate it, if he intended to invalidate it.
Q: But the rulings conflicted, O Shaykh: prayer and breaking the fast?
The Shaykh: Even if breaking the fast and fasting conflicted, he is not allowed to break his fast during the obligatory prayer until he completes the fast with the setting of the sun. As for the voluntary prayer, there is no harm in his breaking the fast.