Raisa
You feel along the wall and can't find any switch or latch or anything. There isn't even a noticeable seem to indicate it would be a fake wall! You tap it with your fists, growling.
"Uh, Raisa, maybe you shouldn't be..." Rebound says.
BAM!
You slam your fist into the wall. Bricks crumble, but disappate into nothing before they hit the floor.
BAM! BAM!
The wall comes apart, all four four feet of its thickness, disappating in a gust of wind. It reveals a continuance of the tunnel straight ahead, but there is another wall infront of that. Twenty seconds later, there's no more wall and the tunnel continues downward. You smell exhaust fumes.
"Never mind," Rebound says.
Johan
Johan, you hear a faint sound like someone breaking apart a brick wall with a sledgehammer, from behind you. You turn to see Raisa slamming through the wall of the sewer, and Rebound ducking flying bricks that seem to vanish as they go. You are now 80 feet from her. You are, however, gaining on the trucks ahead, probably only two hundred yards behind now, so who knows what they are doing.
Focussed on what you hear behind you and the trucks ahead, you fail to spot anyone moving to the side tunnel.
Loki
Something's not right here. First, you hear something like a person breaking down a wall with a hammer or pick. Second, now that you are closer, you can only see the outline of the trucks ahead. If you didn't know better you'd swear they were just an.... ILLUSION! You spin to see Raisa beating down the wall of the sewer behind you about 80 feet and slide to a stop. Michelle and Dara dart past you, oblivious.
You are turned and don't notice anyone moving to the side tunnel.
Michelle
Loki slides to a stop looking back, but you are very nearly to the second smaller tunnel where you're sure Anithos went. Tara is making a semi secretive bee-line for it, keeping behind everyone but Loki as they run.
Everyone Else
You're gaining on the trucks! They are probably only a few hundred yards ahead!
"Guys!?" Anna shouts. "Raisa's punching through the sewer wall back there! I think we've been duped!" she exclaims, turning around and blasting back at top speed.
Again, none of you notice anyone heading for the side tunnel.