Whirlwind Breakpoints

[Ruvanal]

From reading it seem to me that both your scenarios are wrong, and the truth is halfway in between them.
Only the Frame 4 initial attack is a single weapon attack, the frame 8 one is double weapon possible.
That's how I read it anyway.

This also matches what I am getting from reading the various posts (here and PK). In this case it would look like dual wielding is getting 50% more attacks (3 instead of 2 during the first 8 frames). It should start approching 100% more attacks on longer WW path runs, providing that there are at least 2 targets than can be attacked for the length of the runs.