What is the ruling on nasal discharge during prayer only?

If the discharge from the nose is not blood, then the prayer is valid and unaffected by its emission. However, if it is blood (nosebleed), and the worshipper enters prayer knowing that the bleeding will not stop, he should complete his prayer, and it is valid. Ablution is not invalidated by the emission of blood from other than the two private parts, even if it is a large amount.