  We study certain classes of $g_{++}$ deformations of theories arising in
gauge/string realizations of nonrelativistic holography, some of which pertain
to $z=2$ Lifshitz theories while others (pertaining to hyperscaling violation)
comprise certain classes of excited states. Building on previous work, we
consider holographic entanglement entropy for spacelike strip subsystems in a
highly boosted (lightlike) limit, where the strip is stretched along the null
$x^+$-plane. The leading divergence in entanglement in this null limit for
these excited states is milder than the usual area law for spacelike subsystems
in ground states. For ground states, the entanglement vanishes, perhaps
consistent with ultralocality. We discuss this briefly from a field theory
perspective. We also present some simple free lightfront field theory examples
in excited states where correlators are nonvanishing.
