LogFAQs > #888627165

Battler clearly displayed a craving for coffee at multiple points in the story. Battler went into caffeine withdrawal!

The time gap in the dining room was due to the decaf coffee.

Looking at another aspect of the story, we have that Gohda said in red that he applied the charm when he left the servant's room. However, the events in that room were not observed by the detective, so we can say little for certain about it. In fact, it may very well be that Gohda was in the servants room at the time of the murders in there. We do know that Gohda dd not have a master key, however Battler was able to lock a door, so The doors do not require a key to lock. It's entirely possible he locked the door himself, and Genji/Kumasawa were not in the room at the time of the murders. Gohda was the one in charge of the cooking too, so him being the culprit is looking more likely to me. He made the coffee too. Gohda deliberately brewed decaf coffee because he knew the effect it would have on Battler!

Alright, that's better.
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JeffRaze, for all your random spellcasting needs