${\mathbb{Z}}_2$-actions on positively curved manifolds

Kennard, Khalili Samani, and Searle showed that for a ${\mathbb{Z}}_2$-torus acting on a closed, positively curved Riemannian $n$-manifold, $M^n$, with a non-empty fixed point set for $n$ large enough and $r$ approximately half the dimension of $M$, then $M^n$ is homotopy equivalent to $S^n$, $\mathbb{R}{\mathrm{P}}^n$, $\mathbb{C}{\mathrm{P}}^{\frac{n}{2}}$, or a lens space. In this paper, we lower $r$ to approximately $2n\mathrm{/}5$ and show that we still obtain the same result.