It is the second incident involving a Vulcan Fireworks display to have occurred in less than a week.
The same company has apologised for starting the Bouley Bay blaze, Jersey’s worst furze fire for 12 years.
Derek Le Cornu (54), who is part of the Vulcan team, was hit in the face and suffered burns and a gash to his head last night.
He was given six stitches after being taken to Hospital by ambulance.
Mr Le Cornu had just set fire to a a row of explosives on the beach when a spark from one flew off and ignited another firework.
It fizzed into his face after hitting his hand, leaving him bleeding and burned.
Mr Le Cornu attempted to carry on and light another row of explosives, but he was made to stop and was taken to Hospital.
He said: ‘It went off and hit me in the face but I wanted to carry on.
My face was bleeding but I was okay.
Then I was told I had to get treatment and but I didn’t feel shocked until I was in the ambulance.’