Question on Gemini Quest

[Hydra 0]

 I am a little confused by how the Gemini works after reading through the guide and multiple threads. Here are the issues im having trying to understand:

1. It says the Gemini uses SA - In battle would this mean it could use one of my SA, and how would I determine which one it used?

2. It's base damage. I'm a rank 2 1H spear user. From what I've looked at I have come to the conclusion it would have 4 DMG? 2 from my Rank and x 2 from the multiplier, yet this doesn't sound correct to only be doing 4 damage a turn??.

Basically im just struggling to know how much damage it would be doing to me a turn if it landed a hit. 

(P.S. If im asking this in the wrong place please tell me)

[Hirru 0]

It can, but the fact is that you're controling it.  If you want to fight it at its strongest, then it can use your sword arts.

It's base damage would be 1 (Base) + 2 (Your rank) x 2 (Gemini modifier) = 6 DMG

RP him responsibly, because he will probably use the same sword arts, as you at the same time.  (Kind of like Shadow Link in OoT)

[Hydra 0]

Okay thanks a bunch and that seems fair to me.