Abd al-Wahid bin Ziyad (may Allah have mercy on him) narrates it through another chain, in which he also mentioned al-Harith al-Ukli (may Allah have mercy on him), and in it is: If he (peace and blessings be upon him) was praying, he would clear his throat (cough) for me, and that was his permission.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3341