When you think of the bizarre and frankly, twisted set of events that led to the assassination, It beggars belief how such a fucked up day ever got past the reality censors at all. First, this pissant little group of Slavic independence "fighters" no-one had ever heard of, decide to kill the Duke. Because, with FF out of the way, it stood to reason they would be given their autonomy, and their lands back. (Duh!) So they decide to take him out, with a hand grenade. But the fuckwitted grenade tossing Serb, Cabrinovic, didn't know the grenade had a ten second fuse on it. (Either that or he couldn't count up to ten) So it took out the car behind FF instead. And a fair few bystanders as well. The would be assassins melted away in the ensuing chaos. Except for Cabrinovic. In a fit of failure, he then tries to kill himself. With Cyanide. And failed that too. So he drowned himself. In a ditch.
Meanwhile FF, (never one to take a hint) tells his driver he wants to visit the poor unfortunates injured in the grenade blast at the hospital they had been taken to, but unfortunately the driver didn't have a fucking clue where he was going, so they drove around Sarajevo for a bit, looking for the Hospital. As luck would have it, he drove right past the Cafe where one of the foiled fuckwits of the Black Hand Gang, Gavrilo Princip, was commiserating with a traditional Serbian Ploughman's lunch. (A bottle of rancid Riesling, and half a grilled turnip) Princip looks up, thinks "Fuck me, there's the Duke again" leaps to his feet, and shot him dead with his pistol.
That's a bit like if Lee Harvey Oswald really did kill Kennedy, but by taking a shot from the school book repository, missing, then running down all those stairs, and in the panic, finding a nice quiet spot on the grassy knoll, lighting a cigarette (A Lucky Strike, of course) to steady his hand, and then plugging him with a well executed headshot. Then running off to hide. In the school book repository.