Must the missed prayers that were performed sitting down be repeated due to the worshipper's ignorance of his ability to stand, given that blood emerged from the wound in every prayer, and fearing that standing while praying would delay the healing of the wound?

If a person prays sitting, believing themselves incapable of standing, and then it becomes clear that they are able to stand, it is more prudent to repeat those prayers, because they erred in their assumption. Jurists have mentioned in similar cases—such as someone who prayed the fear prayer (salat al-khawf) and then realized they were safe—that repetition is advisable. However, if praying standing would delay their recovery, then they are not required to repeat the prayer, because they had a valid reason for praying sitting.