That's not answering anything here. But I thought about it some more.
It can only have meaning if one interpreted it like this: It's black's turn. If black knew it had two turns in a row, it would play this.
Only in this case these arrows would make sense. Agree?
(Now I wonder if this is even a healthy way of thinking. Maybe an experienced rated player could shed a light on that.)

Howdy folks!
Under Main Options -> Engines we'll find the checkboxes for "Threats" and "Generate Threats" . I know what the option for "Threats" does, but not what "Generate Threats" does.
In the screenshot above, a player played Bf4. The computer thinks if it would have another free turn, it would play Nf3. So far easy to understand.
The second red arrow, connected with a white arrow (white meaning an extra move is needed) depicts a generated threat; Because that's how that option is called.
But how do I interpret this? It's black's turn, and black is not going to play that. If white would get an extra free turn, it would play Nf3 indeed, but black still isn't going to play ...Bd6 to threaten the white bishop.
So what is this thing (option)? How do I interpret this feedback from CB16?