Cliche to sustain a harsh injury, or the fact Asami would hurt someone close to her? I don't see it as cliche, I just see it as a very real thing happening because she isn't in control of herself. She has the potential to hurt just about everyone in the vicinity, but Mako would be the first one to try and stop her without harming her, thus opening him up to a wound. That's just me though =/ 

She wanted training, she's getting it. All worth it in the end <3