@feha so it wasn't that you ware complaning about unrealism but just what is and isn't safe?
There is no reason to think the tip is sharp, nothing in the scenes shown indicate it being a stab, especially since the wound isn't a stab wound unless she stabbed straight through her arm.
Why you would not only assume its a stab but also that the tip is sharp from this? Shes strong, thats the plot, shes so strong that she can cut with a blunt sword, this is standard logic for isekais.
Nobody in a medival setting with anything above basic level sword skill (and these kids are supposedly the elite, basically future knights), would train with wooden swords or whatever your're suggesting.