What do you feel you can personally bring to our group?

You don't just want to say that you're well-trained or that you have the experience. Be bolder than that and flaunt your talents. ER work requires book knowledge, prioritization, and 'good hands,' in an emergency. Tell them about these as part of your tool chest. Our answer example may be a bit cheesy, admittedly, but how else do you answer such a question? The cheesier the question, the more you should rely on generalizations about excellence.