  Algebraic billiards in a plane curve of degree $d \geq 2$ is a rational
correspondence on a surface. The dynamical degree is an algebraic analogue of
entropy that measures intersection-theoretic complexity. We compute a lower
bound on the dynamical degree of billiards in the generic algebraic curve of
degree $d$ over any field of characteristic coprime to $2d$, complementing the
upper bound in our previous work. To do this, we specialize to a highly
symmetric curve that we call the Fermat hyperbola. Over $\mathbb{C}$, we
construct an algebraically stable model for this billiard via an iterated
blowup. Over general fields, we compute the growth of a particular big and nef
divisor.
