Honestly, the evidence that gets to me the most is the hallways debacle.

It really reads more like someone pulled out a gun from the armory assuming that it would be a standard issue but then it ended up being blanks. So it was like taking pot shots at Giovanni who ended up either confused, angry, or both.

Which could have led to him being led to the wine room. And the culprit hiding behind the screen. Giovanni taking a shot at the screen but when he tried to turn on the lights, got shocked.