As we all know the V1 speed is the go no-go speed (although there is debate over that as well but that's another
story) but that speed is for that A/C on that day at that airfield for that Rwy & WX conditions, nothing precludes a command decision to abort after it if the commander considers it unsafe to continue! The commander may have but just a few seconds to decide after V1 but it better be right especially in today's litigations world & bean counters out for a head on a plate if you cock it up!