Fun fact, the warps with the whistle are scripted.
This included the coordinates where you come out.
This is to prevent being pushed off while warping like you were.
The code for Evil Nayru is actually slightly different when not in sideview.
You did see the Switchhook attack this time, though.
The other version had it but didn't use it when you fought her.
You also ran into a minor bug which you probably didn't notice.
The Gale Fruit whirlwind is invisible at times for no apparent reason.
The Pols Voice you met are weak only to arrows.
This means only Nayru and the projectiles made by Quake can affect them.
One of the advantages of shared HP and MP is the ability for one character to heal another.
There's every reason to take advantage of this here.
I chose not to lock out the ability to go the wrong way because I couldn't think of a good way to block it off.
Thus you can choose to proceed without the required item if you want.