I suspect that when the culprit escaped into the wine room, they hid behind the screen. Then, when Giovanni-san went to turn on the light switch, he wound up triggering a short-circuit, incapacitating him. The culprit then pushed the screen on them, and then shot Giovanni-san with his own gun, possibly switching out the ammunition for something explosive before doing so.
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I suspect that when the culprit escaped into the wine room, they hid behind the screen. Then, when Giovanni-san went to turn on the light switch, he wound up triggering a short-circuit, incapacitating him. The culprit then pushed the screen on them, and then shot Giovanni-san with his own gun, possibly switching out the ammunition for something explosive before doing so.