That doesn't necessarily mean the blast radius was large. The 9 year old was killed while holding the pager.

> Fatima was in the kitchen on Tuesday when a pager on the table began to beep, her aunt said. She picked up the device to bring it to her father and was holding it when it exploded, mangling her face and leaving the room covered in blood, she said.

https://www.nytimes.com/2024/09/18/world/middleeast/lebanon-...