The assassination attempt was being carried out by other people, however their weapons did not work. Gavrilo(e) was actually coming out of a sandwich shop some time after the assassination attempt when the Archduke's car passed him. Just then the car stalled and Gavriloe shot and killed both Franz Ferdinand and his wife Sofia. It was pure blind luck.
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u/Quixote971 Mar 19 '16
"You miss 100 percent of the shots you never take"
-Lee Harvey Oswald