Caina Silva, 24, was in intensive care in hospital today after being struck as he walked up a ramp jump just as biker Jeff Campacci landed.

The shock accident happened on Saturday night at the start of a long-running annual stunt show in Barretos near Sao Paulo, Brazil.

Video footage posted on YouTube showed the victim being flung through the air and landing on the ground several feet away after being hit as he reached the top of the drop ramp.

Silva, who was commentating on the feats of his team’s three stuntmen including Campacci for the show, the 13th Barretos Motorcycles, was still conscious when he reached hospital.

He was admitted to intensive care after suffering breathing problems and was last night on a ventilator.

Spectator Jair Luis de Carvalho said: “He was in the biker’s blind spot.

“No-one knows what went wrong. People were left really upset.”

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An organiser added: “The show had just started and the stuntmen were doing their third or fourth jump.

“The biker that hit the injured man is devastated by what’s happened.”