Without knowing any details, that you're framing it this way (their fault for being junior and "excitable") and that you don't mention any failed safeguards and process failures (implying that their mistake was an easy one to make) doesn't let you (and that org) appear in a great light. This sort of thing is a huge org smell for me; people will always make mistakes, how you deal with that fact tells a lot about the quality of leadership.

And what exactly is the "excitable" bit supposed to tell us?