  We describe a new kind of quantum critical point in the context of quantum
anti-ferromagnetism in 2d that can be understood as a quantum critical spin
liquid. Based on the comparison of exponents with previous numerical work, we
argue it describes a transition from an anti-ferromagnetic N\'eel ordered state
to a VBS-like state. We argue further that the symplectic fermions capture the
proper degrees of freedom in the zero temperature phase that is the parent to
the superconducting phase in the cuprates. We then show that our model
reproduces some features found recently in experiments and also in the Hubbard
model.
