You feel sweat bead at your neck and in the next lull, you blurt out a half-baked idea that sounds vaguely clear.
Without a proper understanding of the content, your contribution relates more to the examples given rather than the complex theories being discussed.
Regardless, there are some nods from your colleagues and it reminds the prof of a different way to present one of the theories.
The discussion leads to topics you are more familiar with and you feel less alienated among your peers.