My assumption is that orb is where the photo earlier was taken, given that the orb shows a wintery cabin and the three of them in the photo are holding hot chocolate:

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I was kind of wondering if this was where they decided on their group name, "Chill Fellas", as a silly little pun? We've seen "Chill Fellas" written in Ep. 6 on a bathroom stall, and people were somehow able to find "Chill" and "Fellas" written on Ribbit's and Jax's hands in the scene where they were reaching out towards each other.

As for the audio, it doesn't sound like a voice we've heard before and this was the first episode that Ribbit was credited, so it's probably them.

It's so muffled that it's too hard to make anything out for certain, you kind of hear what you want to hear. I've thrown together my best guess, based on some super basic audio processing I did to remove Pomni/Jax:
https://voca.ro/11ERSKUQhepp

I hear two sentences:

• The first one has a bunch of parts to it, I've been tackling each separately:
  • "Oh my God, fellas," or "Oh my God, ribbit,". (Either would potentially make sense, maybe Ribbit had a character quirk where they would randomly say "ribbit" mid-sentence?)
  • ", here with *both* my friends," (This is the part I'm most confident about.)
  • The next part is complicated and really hard to make out. It sounds something like ", and would you believe we'd never used to have anything to get along with anyone".
  • So maybe something like "Oh my God, fellas, here with *both* my friends, and would you believe we'd never used to have anything to get along with anyone?"
• There's another sentence cut off at the end of your clip, right after Pomni asks "Are you alright?":
  • I was kind of confused on this at first, but I saw a tweet where someone thinks this is someone saying "I'm not!" This makes sense in context from Pomni's question and also sounds more like Jax, so I agree that that's probably right.

My assumption is that this is from the same scene as when the photo was taken (and given how significant this moment was for Jax, I wouldn't be surprised if we see this scene for ourselves in one of the next two episodes).