Tiaral Auto-translated

Inside the room behind the door were two guards; they were very tall, equipped with gold (?) armor and helmets, and held equally elegant two-handed swords in their hands.

Initiative
Relkhiras (147)
Alicia (137)
Tiril (127)
Reinhild (112)
Stefan (102)
Goran (102)
Jert (102)
Gunnar (90)
Ilsa (87)
Sigurd (87)
Thorir (87)
Emma (82)
Mironega (82)
Guard (80)
Klyk (80)
Kataviana (77)
Delhi (67)
Albert (57)
Aldric (47)
Asmund (40)

a whole bunch of them sneaked into the room and are just sitting there, filling it with their presence, there's barely any oxygen left. If someone comes in, they'll be shocked.

Yes, there are quite a few of you.

The castle isn't limitless. Tiril is quite far away; I thought she'd be within a radius of 1 from Rails... But that's not the main point. We start by splitting up the enemy forces, right? And then we finish them off as we go...

It's probably a real crush, like in a crowded bus, where people are stepping on each other's feet and apologizing.

What sword does Relhiras wield, by the way?

With a cutting frame, I think.

So, is that how you use it?

/Probably on the far one./

Take the child in your arms.

Ah, I wish I could throw that bomb we used on the chest into this room...

I'd like to throw a Knight from the arena into this room...

Relkhiras uses Demonic Cleave
Miss
Miss
Guard-9 receives (crit) 1064+500 damage
Miss
Guard-9 receives (crit) 1064+500 damage (-628/2500)

Initiative
Relkhiras (147)
Alicia (137)
Tyriel (127)
Reinheld (112)
Stefan (102)
Goran (102)
Jert (102)
Gunnar (90)
Ilsa (87)
Sigurd (87)
Thorir (87)
Emma (82)
Mironega (82)
Guard (80)
Fang (80)
Kataviana (77)
Delius (67)
Albert (57)
Aldric (47)
Asmund (40)

Not bad guards; they could go to the arena themselves and kill Burtarg.

Added 10 minutes later
In short:
Tyril, Alicia, Rainhild, Gunnar, Sigurd, and Thorir surround and attack the guard. Everyone should reach him, it seems. Of course, the fast girls are in the back positions, and the slow barbarians are in the front. Alicia pierces, Tyril slashes, and the rest just hit.
Stefan shoots disapprovingly. I would even say, prohibitively.
Goran and Jert move to positions from which they can shoot at the guard.
Ilsa also moves to a similar position and unsuccessfully tries to turn him into a puppet.

Is everything correct?

Yes.