Jae Ha Woo
Re: Question about Watson Invisibility
When Watson is adjacent to another character, he is visible, like normal. Because he is visible just by virtue of being next to Bert, his lantern does not come into consideration.
The effect of Watson's lantern is that it can make characters that are NOT adjacent to Watson or any other character or gaslight visible if the lantern is headed in that direction. The lantern does not affect in any way any character that is adjacent to Watson.
The special rule about Watson comes into play in situations like the following. Suppose Watson was on k11, and also suppose that there was no light on h8 (I'm obviously referring to the coordinates in the online game). If Watson's lantern was directed toward Bert, this makes Bert visible, while it does not affect the status of Watson.
I hope this helps!