They started playing some other anthem, and Samuel indicated that they were playing the wrong song.
So she asked for a microphone - and sang it herself.
The inspiring athlete, who became disabled when she was 24 because of a rare spinal stroke, summed up her reasons for doing what she did:
"If you see an obstacle as a barrier, it might defeat you. If you see it as a challenge - then do your best to overcome it."
Hebrew article here.
(h/t O)
UPDATE: Commenter Jack notes that the song being played really is a version of Hatikvah, with a very long introduction. See here.
