Jockeys Jesse Campbell and Earlie Fires both escaped serious injury following an accident during the running of Hawthorne's second race on Thursday.While running on the lead, Icanpersevere broke down approaching the half-mile pole, tossing rider Campbell to the track. Do the Wave ran up into his distressed rival, Fires lost his balance, and also fell to the track. Fires was rendered temporarily unconscious, and Campbell complained of minor right arm and shoulder pain. Both were taken to Loyola Hospital in Maywood for observation. Icanpersevere was euthanized. Do the Wave returned to his stable safely. Campbell's X-rays were negative and he was released."He's a little sore," said his agent Penny Ffitch-Heyes. "He had planned on this being his last day of riding for the meet. He's going to start working horses in New Orleans next week, and has a stakes mount at Calder (Summer Book) on the 11th (of November)."Campbell has won with 15 of his 131 mounts at the current Hawthorne meet. According to Hayes, Fires underwent a precautionary CAT scan and was cleared and released. He has nine wins from 68 starts at the meet. His status for Friday's Hawthorne card is unknown.