Where does Mr boeing say this,his mid 90's(FAA sponsored'Go/Nogo training aid)clearly defines the V1 discipline,any fire or failure "recognized and Reacted to" prior to V1 will result in a rejected Take Off.Some Airline constructors put in their own caveats(100knots differentiates an emergency),any recognized??? tire failure means continue as you've nothing to stop with(rims?).80knots is a little low to consider continuing!!!
Boeing ,in their training aid, does have the statistical sucess/failure rate to"justify" a GO descision in the majority of cases.Do you "brief" for the electrical loss/anti-skid failure in your everyday briefings as to a reject,or was the aircraft certified to stop anyway.
Keep it simple(on the limiting runway) if you haven't "recognized/reacted by Vef(v1-1 second,in most cases,or-5knots) keep going!!!
If you haven't got a Vef definition in your flight manual,ask Management to get the manual up to date(1978)