Okay I'm gonna go back on what I said in another thread and say it makes a lot of since the Mallers knew about the arena. Sending scouts out to find supplies and food they had to have come across it. Durai seems to be going south to scout the Colony, because 40 Radios with 40 Channels, they had to have heard the call Michael sent out. Durai would be the more likely person to scout south because he wouldn't trust a possible stealth mission to anybody else but his most trusted. He sent the rest of his lackies north to the tower to blow it up and probably distract the creatures for a while. I honestly think Durai has known about the arena for quite some time now, because Latch and Scratch said he had a plan for the tankers in a previous chapter.

Prediction: Bricks is going to end up saving Lizzy because he finally figures out she knows more than they thought about how the creatures operate. Tower sends a small scouting party to the arena to figure out what happened, and come across Bricks and Lizzy. Tardust gets attacked by a creature while they are trying to escape after the explosion. Lizzy finally figures out she's prego.