Lev Kreitman has seen plenty of trauma. He was at the Nova festival on Oct. 7, when it was attacked by Hamas. Then, as a reserve soldier, he was sent into Gaza. On Tuesday, when two gunmen opened fire in Tel Aviv near his home, Kreitman leapt into action, shooting one of them. At least seven people were killed in the attack, which took place at a light rail station in Jaffa, in the south of the city. 

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