It happens quickly, but Finnick knows how to think and move quickly. When he sees that Peter has a large number of the mutts distracted -- even defeated -- Finnick runs for the building. The odds have changed, and they've proven that the things can be taken down. It's a risk; the movement could attract attention, but with Diego letting out a cry of pain, time is critical. He might have just lost his lookout.

He knows better than to assume that there being no more visible lizards means there aren't any camouflaged by the trees, but Finnick keeps going. They'll never be sure they have all of them, not in a place like this, and he knows some of the tricks Gamemakers use in the arena to lull tributes into false security. They need to get out.

He only stops when Cho's voice comes through the communication device again, pausing and pressing his back against a tree so that at least one angle's covered. He looks around again, listening for any movement in the trees, and there isn't any. Nor are there any mutts prowling around the building.

"Okay, Cho? I'm just south-east of the door, by the edge of the forest. You're clear. You run, I'll meet you partway and we'll get out of here, okay?"