I mean, they are standing there staring down a wall of moving molten mantle matter with presumably no place to escape other than over the cliff from whence Mark just rescued Abbey…

Note the tree all aflame in the panel near Mark’s head… I’m sure that’s an interesting phenomenon watching the lava issue forth and items in its path reaching a level of spontaneous combustion… like a tree that had, only seconds before that, been alive and vital and full of life force… Mark and Abbey better take a cue from that before they both spontaneously combust…