McGee did good – his reasons for trusting the witness were solid and the witness is very credible. The kid's got good instincts, Gibbs is obviously proud. This is the first time McGee's lost a witness and he takes it hard, poor baby. Tony gave McGee good advice – McGee can't change what happened, but he can find her killer. With some seasoning, McGee will be an excellent agent. He's a really sweet kid.
Kate and Tony re-enacting the crime gives new meaning to playacting – they got way too much into it. Hilarious. They are like children though – like Gibbs' threat, he really is like a high school principal.