A Quantitative Reeb-Form Obstruction for Real Hypersurfaces of Strict Nearly Kähler Six-Manifolds

Let $M^5$ be an oriented real hypersurface of a six-dimensional strict nearly Kähler manifold $(\widetilde M^6,\widetilde g,J)$, and let $ξ=-JN$ and $η=g(\,\cdot\,,ξ)$ denote the induced Reeb field and Reeb one-form. We prove the pointwise obstruction \[ (dη)_p\neq0\qquad\text{for every }p\in M. \]