Confusing feat text for Teamwork feat Improved Spell Sharing

[Hock]

Was looking through the Teamwork feats, and something caught my eye as a potential good feat for a Eidolon-Mounted Summoner build I am working on - Improved Spell Sharing. It sounds like pretty much the same idea as Improved Share Spell, but potentially much more powerful, assuming I'm reading it correctly.

So, some questions. First, it says it requires the ability to gain a class companion creature. It then says if you cast a spell and your companion has this feat, you can split the duration. But how are they supposed to take the feat if it requires having a companion, and they don't have one of their own? RAI would obviously imply that it should require either having *or being* a class companion creature, but given that I am making this for PFS, I primarily care about the RAW interpretation.

Second, it does not explicitly say that you both need the feat like some of the other Teamwork feats, it says if your companion has it you can share the spell with them. Given that it's a teamwork feat, would I be correct in assuming that you both need it to qualify? I guess that would be the mitigation for being able to get it 10 levels earlier than Improved Share Spell - using up twice as many feat slots.

[Avoron]

Yes, you both need it.
No, your companion creature does not qualify to take it.
You need something like the Hunter's or Cavalier's ability to share teamwork feats, or a Horsemaster's Saddle or a Ring of Tactical Precision.

[Hock]

Ah, makes more sense in that context - given that it specifically said it worked for Eidolons in the feat, I was trying to figure out how an Eidolon could get it since they didn't have anything like the Cavalier's ability. Being able to use items fixes that problem.

Question about the Horsemaster's Saddle. Does this item map to a slot on the summoner wrt the shared item slots between the two, or would it essentially be a "free" slot on the Eidolon?

[Mathius]

In order to use this feat you have to have the ability to give your teamwork feats to you AC. Hunter comes to mind here.

Inquisitor can benefit as well since his companion would not need the feat for it to work.

A reasonable house rule would be to allow ACs to take this feat if it is not granted to them. Maybe int 3.

[Avoron]

It seems like RAW the saddle is slotless, but I think this item came before the rules for animal companion item slots and "saddle" slots.

I'd check with your GM. If it's for PFS, perhaps someone on the forums who knows more about that can give you an answer. I'm not sure.