V1 confusion
Just been going back over my ATPL notes and have become a bit confused regarding V1.
Bristol notes Performance 3.14 definition
'v1 means the maximum speed in the take off at which the pilot must take the first action (e.g. apply brakes) to stop the aeroplane.
However... Bristol notes performance 5.8
'A further 2 seconds is allowed between calling 'stop' at V1 and actually starting to stop the aeroplane.'
Bit surprised of such a clear contradiction but perhaps i am misinterpreting it.
Any help much appreciated and before anyone asks yes i have tried searching but nothing answering my question.
Cheers