1 Mike: Let’s not fight over whether it makes sense that there’s lava down here. We want to avoid the lava trap anyway.
2 Dustin: No, I reckon we show her. I want to prove I’m right!
3 Mike: You realise the only way to see the lava is to activate the trap and fall in?
4 Dustin: Could be worth it.

Proving yourself right is worth pretty much anything.

One interesting thing is that people wouldn't really fall into lava. Or molten metal for that matter. Liquid rock and metal are so dense that bodies won't sink into them at all - you'd just lie on top, barely even making a dent in the surface, as your body catches fire and incinerates.