The sides of the pit were glazed as if the rock were melted.
3 seconds sound clip from the Attack of the Crab Monsters (1957) movie soundboard.
You can hear this line at 00:44:03.033 in the DVD version of the movie.
Quote context
[...]
- That means that the crab can eat his victim's brain, absorbing his mind intact and working.
- It's as good a theory as any other to explain what's happened.
- But, doctor, that theory doesn't explain why Jules' and Carson's minds have turned against us.
- Preservation of the species. Once they were men, now they are land crabs.
- Okay, professor, how are the crabs blowing up the island?
- I am not sure. But I imagine they are able to send out arcs of heat. They are packed with it.
- The sides of the pit were glazed as if the rock were melted.
- Why?
- Looks like we're on the verge of a blessed event.
- Or is this the one you killed?
- No, it is still alive. We did not kill it.
[...]