A vortex grenade does not much damage. If he can survive a pulse grenade (basically the same exact thing, just a different color (yes it is the same (have you played halo 4? Do you know what a pulse grenade is? It works the same exact way! (It stays in place for a few second and then diss appears while dealing damage over time))))) I think he can survive a vortex grenade. Heck he even hops through a bunch on vortexes throughout the entire Halo series!