Quoting Chuck Bass:" My first step would be having a meeting with the manager and asking for them to pay the bill. I think ... [snip!] ... for that much. Yeah, your son was climbing a pole. But hell, they shouldn't have sharp edges in the middle of the store."
had he not been climbing the pole it wouldn't have mattered that the sharp edges were there, she should be thankful he only has a cut leg and not a busted head. It could've been much worse. Calling and asking them to cover it should suffice, they shouldn't have to pay the medical bills of something that wouldn't have happened had she been keeping a better eye on her kid.