"Run!" Wally screamed as he took to his heels and made his escape.
Astar and Klein didn't dilly-dally either as they ran away from the scene. None of them had their four fellow students in mind, as the only thought in their heads was to escape.
The desolate beast was at the peak of the first level of the Apertures Opening stage. It was an opponent none of the students could take on their own. Escaping was already a challenge, so there was no need to consider rescuing their classmates.
[1] Figurative expression.