Sandoval tells ABC7 News' Luz Pena that he was at his booth when he saw someone walking around with a firearm. He says people were jumping into his booth and trying to hide under the table.
A city official says three people died and 12 people were hurt during the shooting at the annual event.
The California food festival is a nationally known three-day event that attracts thousands of garlic lovers. Sunday was the final day.
Get the latest on the deadly Gilroy Garlic Festival shooting here.