Quick questions: javelins with dueling style and natural weapon proficiency

[Garhi]

My ruling does not rely on rules I make up.

When you make up a rule its called "house ruling".

Figuring out if a statement is a house rule or not is simple. Read the rules. Do the rules actually say that or are you providing the rule from elsewhere (by making it up)?

Can you cite a rule that states your weapon transitions from being "wielded in one hand" to being "wielded in no hands" when you throw it as part of an attack?