The bullet from a sniper rifle can't turn corners, much less lock onto a target, and throwing knives are silent, making no sound, unlike firearms which, even with a suppressor, would still make a noise.
Three months ago, an important figure from a small country, surrounded by numerous bodyguards, stood in a square speaking to the people. But as he spoke, a throwing knife suddenly pierced through his guards and lodged in his head, killing him instantly. At the time, the incident caused a great sensation.
This significant person from the small country had survived many assassination attempts, protected by professional bodyguards hired from abroad. With their vast experience, they had fortified his security impenetrably, allowing him to evade multiple assassin's attacks, earning him the reputation in the world of killers as one of the hardest targets to assassinate.