That's a really strage thing to see. It's hard to figure how he could do that as the plant stem shouldn't be that stiff. I hope he heals.
On the lighter side, when I saw this post, I had to check it out, especially when I saw that a knife fish had stabbed himself. I thought it was a joke. That is a funny topic line. Once again, I hope you can get it all removed and he gets better.