Negative carry
What happens
The short leg pays instead of receiving, and holding the hedge costs money before any other failure applies. This is not a tail case: SOL perpetual carry has been negative on the recent windows while the longer ones read positive, so the regime is something the book moves in and out of rather than an edge it occasionally touches. Every window is published with its sign and its coverage.
What Poyz does
Issuance is refused below the carry threshold, so the book does not grow into a losing position. The buffer absorbs the cost on the existing book, and the protocol deleverages on published buffer thresholds as it drains.
What it does not do
The gate protects new issuance, not existing holders. A regime that outlasts the buffer reduces backing per unit for everyone already in, and deleveraging trades carry cost for disclosed directional exposure rather than making the cost disappear.