Dear Arunan

I am thinking about adding these two references with
respect to dynamic definitions of hydrogen bond.
Do let me know if you know of any other important
references that we should add. I would like to ensure
that we cover as much as possible.
D. L. Bergman, Chem. Phys. 253, 267-282 (2000). Topological
properties of the hydrogen-bond network in liquid water.
R. Kumar, J. R. Schmidt and J. L. Skinner, JCP, 126, 204107 (2007)
Hydrogen bonding definitions and dynamics in liquid water.

Maybe you could add

Also, could any of you send me a few lines that could be added
highlighting the need for a dynamic definition when dealing with
liquids?

Maybe you could introduce a few lines saying something like:

"H-bonded interactions are often responsible for specific properties of liquids. This is especially true in highly structured liquids such as water.

When such an h-bond network is present, specific dynamics occur over a range of time scales, from femtosecond fluctuations that involve a few molecules to subpicosecond diffusive motions that involve the breaking and forming of hydrogen-bonds.

Nowadays these dynamics can be experimentally investigated with time resolved infrared spectroscopies as well as simulated with computational techniques; it is thus likely that in the near future dynamic properties could be added to the list here proposed as further criterion or distinctive characteristics which identify h-bonds."