When Wash pauses to shrug, the Chief nods. He knows exactly what he means, there's only one right thing to do when presented with that.

"And then you got split up," he says, because of course. They can't have people working together, can they? It doesn't make for a good show. Arcade must be a very busy guy right now.

"We're going to find Arcade. He can only slow us down for so long. Then he'll get his."

It's a declaration of intent with the determination that destroyed Alpha Halo behind it. The Chief can be teleported and shot at and chased and boxed in, but he does not stop until the mission is carried out. He may not know how he's going to do it yet, but he is going to find the bastard and he is going to finish this.

There's a slight breeze up ahead, and the tunnel widens into a room where another tunnel forks off, straight down into the floor and up into the ceiling. The sides, ridged like some kind of architectural trachea, slope off rapidly into the blackness. The floor shudders a little and air rushes through the chamber, like the whole complex is breathing. It trips their motion trackers, several blips lighting up as the organic walls shift above and below them.

...Except one of them doesn't disappear as the tunnels settle.

Shit.