...They could just not mention it? 

Possibly. But 9S would prefer not to deceive allies like that. Causing others to join a fight under false pretenses only sets up later trouble.

...Sure.

This isn't the time for discussion, though.

No.

And she's having a bit of trouble holding onto the spell - the closest they can get to Ronan is the edge of their enhanced hearing range, before the world they're seeing starts to warp unnervingly. (Though no one they're spying on reacts.)

Perhaps a retreat, for now.

Yeah. 

They need to back up before Loki can safely return them to their bodies, but once they do - it's pretty straightforward to go back. 

"That was an experience."

Nod. "It was. Did you learn what you were after?"

"I did."

"Anything other than 'Ronan has the Reality Stone, and isn't pursuing us?'"

"You're not exactly who we thought you were, are you?"

"...What do you mean?"

"Loki should have known Gamora. Should have worked with her before. Should have recognized the Reality Stone."

...She bites her lip. 

"I'm Loki," she says, totally honestly. (Though she sounds nervous, too.)

"Memory loss?"

...Sigh. "Yeah. My first memory is - getting captured, though I still - know how to do things. Just not why. But I don't know what happened to cause that."

"Asgard doesn't consider amnesia a good defense against - whatever charges were against me, though."

"I'm sorry."

"...It's - I don't regret existing."

And then: "But I'm still useful. I still have all my abilities," she says, somewhat defensively. 

"I know what it's like," 9S says. "To be- missing your self like that. Reconstructing from scraps and thirdhand accounts."

"...I'm Loki, but..."

"I don't know if I'm the old Loki. If there's any meaningful way that we're the same person. Or if I want to be."

"Mm. That's not a question anyone else can answer for you."

"...I do want to - learn more about her."

"I can share what I have."

"Thanks."

"...You're taking this well."