Pausing in the Qur'an when there are no pause marks

I have had this question for a long time. I noticed that many Qaris and Sheikhs sometimes take a pause in their recitation, even though there is not waqf (pause mark).

Is this due to a pause (for example, a new sentence or clause) in the Arabic meaning? I noticed that all the pauses are made when there is a pause in the meaning (Arabic and English).

Not all reciters do this, but I know that some do.

For example:

وَلَقَدْ أَخَذَ اللّهُ مِيثَاقَ بَنِي إِسْرَآئِيلَ وَبَعَثْنَا مِنهُمُ اثْنَيْ عَشَرَ نَقِيبًا وَقَالَ اللّهُ إِنِّي مَعَكُمْ لَئِنْ أَقَمْتُمُ الصَّلاَةَ وَآتَيْتُمُ الزَّكَاةَ وَآمَنتُم بِرُسُلِي وَعَزَّرْتُمُوهُمْ وَأَقْرَضْتُمُ اللّهَ قَرْضًا حَسَنًا لَّأُكَفِّرَنَّ عَنكُمْ سَيِّئَاتِكُمْ وَلأُدْخِلَنَّكُمْ جَنَّاتٍ تَجْرِي مِن تَحْتِهَا الأَنْهَارُ فَمَن كَفَرَ بَعْدَ ذَلِكَ مِنكُمْ فَقَدْ ضَلَّ سَوَاء السَّبِيلِ

And Allah said: "I am with you: if ye (but) establish regular prayers, practise regular charity, believe in my messengers, honour and assist them, and loan to Allah a beautiful loan, verily I will wipe out from you your evils, and admit you to gardens with rivers flowing beneath...

There is no pause mark after "qar-dan hasa-nan" on the mushaf that I am using. However, there is a pause in the meaning; "a beautiful loan, verily I will...", so the Qari in particular (Mahir al Muaiqly) pauses there I assume to emphasise the meaning.

This is not a rule people learn when reading the Qur'an (because they aren't taught the meaning) and my teachers assume that I'm making a mistake because I am pausing when there is not a pause mark, but I only do so because the Qaris I listen to do it.

Another example:

الَّذِينَ قَالُواْ إِنَّ اللّهَ عَهِدَ إِلَيْنَا أَلاَّ نُؤْمِنَ لِرَسُولٍ حَتَّىَ يَأْتِيَنَا بِقُرْبَانٍ تَأْكُلُهُ النَّارُ قُلْ قَدْ جَاءكُمْ رُسُلٌ مِّن قَبْلِي بِالْبَيِّنَاتِ وَبِالَّذِي قُلْتُمْ فَلِمَ قَتَلْتُمُوهُمْ إِن كُنتُمْ صَادِقِينَ

[They are] those who said, "Indeed, Allah has taken our promise not to believe any messenger until he brings us an offering which fire [from heaven] will consume." Say, "There have already come to you messengers before me with clear proofs and [even] that of which you speak. So why did you kill them, if you should be truthful?"

Again, some Qaris pause after "qultum", because that is the end of the clause/sentence/train of thought. But there is no pause mark.

Is there any particular reason why this is done?