[Discussion] Theory: Foxidna noticed an unseen force was spying through the birds on the balcony
Around 10:58-10:59 of Episode 73, Foxidna's smile transitioned into a look of surprise/shock as if she detected something very particular, such as a hint of mana from somebody else or detecting somebody's else presence outright.
Given Beatrice is reliant on Subaru's mana, touching Beako can probably result in you detecting Subaru's mana (since draining mana allows you to determine whether someone is an enemy, touching someone probably does at least what I stated) and realizing the connection the two of them have, and Foxidna may have detected an unseen force spying through the birds or at least that one bird since she stroked a bird's chin.
Subaru has also an unreliable narrator on multiple occasions, such as believing that Julius beat him at full strength, believing that Crusch was a heartless person for being unwilling to help Emilia, and counting his chickens before his eggs hatched in thinking he'd get a perfect victory in the first loop after the White Whale fight, and given viewers are getting direct images of what the birds are seeing, it would be very fitting if this is another case of that, meaning somebody else is also observing them.
I've noted the possible importance of birds before in my post here with the one very tiny bird and the outline of a bird embedded in the wall if you look at it from a particular angle: https://reddit.com/r/Re_Zero/comments/1nliyyt/discussion_2_hidden_mural_birds_from_rezeros/#lightbox
Two birds were also initially present right as the From Zero moment was about to begin at 17:22 of Episode 18 before tons of them emerged at the height of From Zero and also during Subaru's speech in Episode 57 in Season 3 when they hung out where Emilia was held captive at 25:37 before flying over to the government office where Subaru had his speech at 25:45.
Here's a link to the image of the birds in Episode 18:
Here's the links to the images in Episode 57:
https://ibb.co/xK0sXz46 https://ibb.co/v4WgfzWQ
Birds were heavily featured even when Subaru was summoned to Re:Zero's fantasy world:
So there may have been an unseen force observing Subaru since he was summoned through the birds in addition to Satella, who we know is always watching Subaru.
Given how important the number three is in Re:Zero, it wouldn't surprise me if there were actually three forces watching Subaru from the moment he stepped out into Re:Zero's fantasy world. Who could it be if such a thing is indeed happening?
I believe it is Echidna who is the third force that has been observing Subaru since the beginning. Echidna literally said at one point that she had watched Subaru every step of the way of his journey after he was killed by the Great Rabbit, and while it could've been a false statement since she has literally lied to Subaru three times already, I'll share why I believe that she was telling the truth.
We've known since the beginning that Satella is choosing Subaru's save points, which begs the question about how she knows at what point Subaru can make a difference. A lot of anime-onlies and novel readers believe in the theory that Satella and Subaru travelled back in time four hundred years to ensure that this current Subaru succeeds, and although I am adamant that this theory is false I will nonetheless use it to support my argument.
Let's say that this is true and Satella actually is a future variant of Emilia. How would she know in the current day at what points Subaru can make a difference so that he succeeds this time? The answer is that she doesn't. Even if she knew how the previous Subaru's run through as the hero worked, that doesn't mean Satella 100% has an ironclad way of knowing what's the best point for him to still be able to make the most impact given what failed last time would obviously fail again while what would've worked last time may not this time. The only way to know for sure is with future knowledge for this current world, which is why I'm now proposing that Satella has a contract with Echidna in that Satella shares her field of vision with Echidna for some unknown price we viewers aren't privy to.
If Satella did have this sort of arrangement with Echidna, it'd explain why she makes the save points she does, and it'd be 'cause she consults with Echidna beforehand, who we know to have future knowledge and acts with it in mind as shown when she turned Petra's handkerchief into a spectral knife for Subaru to kill himself after he revealed RBD to her. Echidna also looked forward into the future hundreds of years ago given she made Puck with the express intention of defeating Melakuera only for Puck to lose his memories so that Roswaal could draw Emilia into his camp with Puck losing his memories of the Roswaal who co-existed with Echidna four hundred years ago, making him oblivious to Roswaal's Soul Transcription. Certain parts of the fandom say that Echidna doesn't use her Authority, but I call BS as she has clearly used it in well in advance hundreds of years ago.
As for the unseen force seeing through the pigeons, I don't know who it could be.
What are your thoughts on this?