While playing Scorn, after freeing the hatchling from the puzzle, you don't have to immediately kill it, but there is a way to save it, though the game will take slightly longer to complete.
Since I am doing a second playthrough, I will see what actually happens at the end of the game if and when you save the hatchling. You can check out the timestamps below to see the outcomes of both decisions.
Timestamps:
0:00 Kill the hatchling
3:04 Save the hatchling
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