Malik said, "Someone who has a nosebleed on the day of jumua while the imam is giving the khutba and he leaves and does not come back until the imam has finished the prayer, should pray four rakas.''

Malik said that someone who prayed a raka with the imam on the day of jumua, then had a nosebleed and left and came back and the imam had prayed both rakas, should complete the prayer with another raka as long as he had not spoken.

Malik said, "If some one has a nosebleed, or something happens to him and he has no alternative but to leave, he does not have to ask permission of the imam if he wants to leave on the day of jumua."

Muwatta Malik Book 5, Hadith 13