The bus driver Enzo Lombardi (Account name BuenMaik) bused 1 and 15 first night. 1 is veteran and 15 is survivor. From his PoV, he gets the "Neutralized by the veteran you targeted" twice. The same thing happens when day 2 starts. It shows that 7 was "killed by a military-grade assault rifle. Then he was attacked once more..."
In this particular save, there was only one Neutral Killing possible (In this case, a Serial Killer) and the Mafia, and both of them had killed targets that night so they could not of attacked 7 as well. Also, there is no possibility of witch to control a Vigilante to cause him to shoot.
Here is the replay. It doesn't finish to the end of the game due to my curiosity on how 7 was double attacked:
Bus Driver Vet Bug.SC2Replay