That sign was actually probably a bit closer to blinking neon arrows pointing to the easy target. And Dennett was, at least, aware of it, which was why he looked so, well, squirrelly.

And Alex can whip out that stony face as much as he wants: he's not fooling Dennett. "We? What we? Alex, you have to find her. She could get..." well, the end of that sentence was pretty obvious, wasn't it?

"I can't 'hole up' here!" He pointed to the sign, with the venomous snake name. "These creatures are loose." And possibly slithering up to Dennett 'Easy Prey' Norton. He looked around the ground, anxiously. Can snakes climb bare legs? Probably.