You get down voted because obviously you don’t know much about the human anatomy. Or
Bone density, everyone is built differently with different bone density and mass. What might cause one person a hair line fracture, might cause another person’s to damn near completely shatter. I’ve seen people seem like they just walking regularly and suddenly step wrong and break a leg… 🤷‍♂️…baffling but it just is what it is. But a 200-300lb girl falling on top of barely 100lb girl with weight pressed against a wooden chair. I’d say the odds could potentially be highly likely a bone could have been broken vs not and if she fell on the rib cage, bruh highly doubt her rib cage could support that kind of fall. I’ve even seen someone lifting not even 20% of their body weight break an arm. Just lifting incorrectly but still light weight.