(a) The same hadith is reported through another chain, but in it the wording is as follows: "He (peace and blessings be upon him) said: I called you but you did not answer me. He said: I was praying," that is, he narrated it with the same meaning.
(b) In this there is evidence that the Companions' (may Allah be pleased with them) answering the Messenger of Allah (peace and blessings be upon him), when he (peace and blessings be upon him) asked them about Dhul-Yadayn (may Allah be pleased with him), "What is he saying?", did not invalidate their prayer, because it has been narrated to us from Hammad bin Zayd that he said in this story that the Companions (may Allah be pleased with them) gestured.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3931