She goes along with it... sort of

The warehouse next to the Gilded Cage, the next day at 7pm.

"Just so you know Supergirl, I'm disappointed in you, I mean, not even 10 minutes after you find out she's in National City, you've managed to end up in Roulettes control" Alex, wearing her trademark black but without anything to identify the DEO shakes her head as she looks around the empty arena.

"Well, yes, but there were these wom-"

Walking up from behind the two, Roulette interrupts "Oh I do like the sound of that agent, Supergirl under my control. Maybe we should make a little bet on the fights, what do you say pet-to-be?"

Glaring back at Roulette, Supergirl shakes her head "Oh no, no bets, and I'm no ones pet, so stop with the names or I'm out!"

"I'd like to see you try... pet, oh calm your tits, I'll call you Super, at least until you loose a fight." Roulette's smirk turns predatory at that thought.

"Hah, as if anything here is going to beat me" putting her fists on her hips, Supergirl does her best heroic stance.

Giving Supergirl a once-over Roulette nods her head "Hmm, I like that look on you, would look perfect as a rather kitsch statue at the entrance to this arena."

Stepping up and placing Supergirl behind her, Alex stares at Roulette "Now miss Sinclair, you asked her to bring a 2nd and she did, me, so what does a 2nd do here, who is she fighting and when can we get all this over with?"

"So impatient, your job is to get your fighter ready for the next bout, whatever that entails.
As for your opponents, they are a Tamaran royal guard, a Daxamite construct and a former coworker of yours I think, Jim Harper"

Alex eyes widen at the name of the man that sent her off to project Cadmus when he temporarily ran the DEO "Harper? Why would he think... do you have Kryptonite here? If you do, this will be your last day as a free-"

Lifting her hand in a placating gesture, Roulette steps to the side and gestures toward Supergirl "Now now agent, hasn't Supergirl told you the rules? I gave her a list before she flew of yesterday"

"Rules... what does she mean K-Supergirl?"

At Alex's increasingly angry glare Kara takes an involuntary step back "Um... well, the fighters have to be limited to the weakest combatants approximate power level..."

"You knew this and didn't tell me? Of course you didn't, because I'd lock you in a cell before letting your bull headed ass come here and do something so stupi-"

"Ladies! Save your old married couple act for later.
Supergirl, while the two first fights will let you be at full power, did you bring anything to make your power limited to human normal?"

"Yeah, I did, so I'll-"

"The fuck, you brought Kryptonite here, you HAVE Kryptonite? Are you fucking insane?" Alex ends up just standing there and waving her hands a bit, at a loss for words, before grabbing Supergirl and pulling her off towards a corner of the stands. "Excuse us Roulette, we need to have a quick pow wow"

Trying to placate Alex before she gets off to a rant, Kara stars speaking rapidly as soon as they are out of earshot of Roulette "Relax Alex, I know how they are measuring this, it's Lena's damn power detectors, the same ones that a lot of clubs and other places have started using.
My bracelet is designed to show me as perfectly human in power, but lets just say that I'll be rather more than human in how much I can take.
Besides, I've been training with you under Kryptonite radiation for years now and I even beat you some of the times, and with this one I'll be a lot tougher than under those lights!"

Still looking rather pissed, Alex sighs and examines Kara's face "Ok, so if this is so safe and well thought out, why the hell didn't you let me know beforehand?"

'Oh shoot, that's her, "I'm trying to be strong but you really hurt me" face, why the heck didn't I just tell her yesterday'

"I... Well... you'd probably not trust it without testing it and while it's perfectly safe for a few hours, it is Kryptonite and if I wore it for like, a week or more, I'd start to be more human like and fragile in every way.
Besides, as you said earlier, I kind of expected you to lock me in a cell to keep me away from this if you knew, I trust you with my life Alex, I just... well... I don't trust that you'll let me get a little hurt even if it is for the greater good."

Clasping Kara's shoulder, Alex nods her head "Ok, I'm not sure what greater good this is helping, and we really should be able to talk openly and honestly about these things. Once this is over, there'll be a movie night with a lot of ice cream and talking, ok?"

Giving a brilliant smile back, Kara nods eagerly "Yes! Now let's go and I'll kick some ass!"

As the two women walk back to her, Roulette rolls her eyes a bit as she taps her watch "Ok, you're ready? Good, we're already behind schedule so let's get this show started.
The first fight is against a royal guard from Tamaran, due to the potential fire and heat beams going all over the place, this and the next fight will be filmed but not have an audience present"