The relevant wording is: “No prayer.”
This indicates that he negated the legitimacy of performing any prayer once the iqama call has been given.
(4-6-4) Entering the Mosque While the Imam Is Delivering the Friday Sermon
If a Muslim enters the mosque while the imam is delivering the Friday sermon, he should not sit until he has prayed the two rak'ahs for greeting the mosque, keeping them brief.
The evidence for this is as follows:
Jābir ibn Abdullāh reported: Sulayk al-Ghatafānī came on a Friday while the Messenger of Allah, peace and blessings be upon him, was delivering the sermon, and he sat down. The Prophet said to him: “O Sulayk! Stand and pray two rak'ahs, and keep them brief.” He then said: “If any of you comes on Friday while the imam is delivering the sermon, let him pray two rak'ahs and keep them brief.” Recorded by al-Bukhārī and Muslim. (1)
(7-4) Prayer Between the Call to Prayer and the Iqama Call
It is recommended for a Muslim to pray between the call to prayer and the iqama call. The evidence for this is as follows:
Abdullāh ibn Mughaffal reported that the Prophet, peace and blessings be upon him, said: “Between every two calls there is a prayer; between every two calls there is a prayer.” Then, on the third occasion, he said: “For whoever wishes.” Recorded by al-Bukhārī and Muslim. (2)