Musannaf Ibn Abi Shaybah 8865 — A question on prayer

Sufyan was asked about a man who joined the imam in the congregation on Friday, then his nose began to bleed; he went and performed ablution, and when he came back the imam had finished the prayer, but the man had not spoken to anyone: what should he do? Sufyan said: He prays two rak'ahs, like the imam's prayer.