My point, badly put in post above, is that there are ways to know the outcome ahead of the momentum ignition, rather than reacting to it.
I'm not a microstructure guy, so the only things that come to mind for me are order book delta or something like garachen's VPIN suggestion. I'm sure there are a bunch of others that I'm entirely unaware of. When you say "know the outcome", do you mean that you know momentum ignition is about to begin or that if it does begin, you have a good approximation for the extent of the ensuing move?