It's the first one where we see threats of long-term damage with a "nipple torn off". I doubt that could happen from clothes pins, but it was another level of threat than what we've seen before.
Yeah, um, as someone who HAS done nipple play like this, her nipple wouldn't be torn off. There are lots of things like doing a "zipline" of clamps, and yanking them off with a rope in order. The shock factor comes more from the fact that the compressed skin gets restored full blood flow, refreshing the pain again. She wouldn't get her nipples "torn off" at all.
That said, this chapter had me laughing in stitches until i couldn't breathe.