I am the best audience member one could possibly ask for. If I see them struggling, I still smile and nod with the hope that they become confident and that they already knew the material and this new-found confidence sets them back on track. It helps sometimes. They see I'm listening, while the rest of the class is bullshitting themselves thinking they're studying, sitting there with a book open or watching Kaplan lecture videos clearly ignoring them presenting, and so even if they did do a shit job, it's just the grade that says that, not the class's response.
I lost my shit presenting a case on diuretics two weeks ago. The girl of my dreams was absent that day (thank fuck she didn't see me in my hour of despair) but because a few students (not friends, mind you) still looked at me with a look that showed some deep interest (which could easily be misconstrued as a "what in fuck's dick are you talking about, that's wrong" look) I quickly recovered and let the black guy in our group lose his shit after my turn instead.
Yeah, we weren't allowed to pick our groups.