If you're at the company I think you're at then your OM A deals with this. 8.3.0.3.11.2 - under point 4 it deals with profile deviations below the landing gate. A GA would only be mandatory if you do not believe touchdown will be within the TDZ. So 4 reds is not necessarily a GA once below the landing gate. Whether or not a GA is sensible in that scenario is another matter.