I wonder if it was that unique twin bond, kids have; or that the *lifter* was the one who caused the dresser to tip, by climbing in the drawer. Fear of punishment and/or good old fashioned common sense at such a young age. Good for the tike.
Guardian angel earned his keep.
My understanding of the story is that the climber tipped the dresser on his brother.
What I find amazing is that neither boy panicked. No screaming at all.
The trapped boy just waited and the other calmly went about the work of freeing his brother. Amazing.