Iron will has indeed a special talent: train ponies the wrong way. It worked on Fluttershy, now Trixie. Hey jung mare, your special talent are magic shows, not physical fighting. Well, looks like discovering the own cutie mark is noth enough. You have to understand what's telling to you. And Trixie doesn't lissen. Too much be gided by her anger for Twilight. But maybe, she needs that. It's indeed a great artwork and best of all: I think this really works with Trixies personality. She would even do that.