Almog Peretz, one of three people wounded in Saturday's shooting at Congregation Chabad, spoke with CNN's Oren Liebermann about the attack.
Peretz, who is visiting San Diego from Israel, said he was shot in the leg, where the bullet is still lodged. Doctors are evaluating whether to removed it.
"Thank God I am slowly, slowly improving," he said.
Peretz was in the synagogue with his family and was taking a friend's daughter to the dining room when the shooter entered the building, he said. He said he heard a gunshot, turned around to look and saw the shooter standing in the lobby.
"He stood by the door so he could escape. He was calm, he stood like a soldier and he shot like a sniper. Standing calmly in the doorway and just shooting so that if he had to run he could," Peretz said.
Peretz said he was across the synagogue from the shooter and did not see anyone else shot. He saw the shooter "line him up, almost like he had a sniper, and aimed, and started shooting."
That's when Peretz believes he was shot. Peretz said he ran to an emergency exit door and told nearby children to follow him. Peretz took the kids next door to the rabbi's home. He then returned to the synagogue to search for a niece who was missing. She was later found hiding in the bathroom in the synagogue, he said. By the time Peretz returned to the synagogue, the shooter was gone, he added.
One of Peretz's other nieces, 9-year-old Noya Dahan, was injured by shrapnel but has since been released from the hospital, he said.