The "something bad" could happen at any time. They might die that night. Their attempt to nominate someone else might fail. They might be executed instantly, instead of whoever would have been on the block. Alternatively, something bad could happen to someone else, such as a useful townsfolk role dying early, or a crucial townsfolk's ability not functioning.

Not using an ability doesn't count as a "choice". If Onesifi doesn't make a public statement, future statements aren't considered to be null and void. Instead, all statements are treated as if they're the same as Onesifi's first statement. Similarly, if Paeon delays using their ability, Dys has no impact: after all, Paeon will only use their ability once. If a character's ability changes, or they become "frozen" after having used it, their choices are only frozen from their first use of the ability while frozen. If a character's choice becomes invalid (e.g. "choose a living player"), it functions anyway if possible. Otherwise, nothing happens. In either case, the frozen player doesn't learn this.