In this paper we give a new characterization of real hypersurfaces of type B, that is, a tube over a totally geodesic $mathbb{Q}P^n$ in complex two-plane Grassmannians $G_2(mathbb{C}^{m+2})$, where m = 2n, with the Reeb vector $xi$ belonging to the distribution $mathfrak{D}$, where $mathfrak{D}$ denotes a subdistribution in the tangent space $T_xM$ such that $T_xM$ = $mathfrak{D}{igoplus}mathfrak{D}^{ot}$ for any point $x{in}M$ and $mathfrak{D}^{ot}=Span{xi_1,;xi_2,;xi_3}$.