I use these two videos with my students to help explain the go / no go decision.
Part 1:
http://www.youtube.com/watch?v=raCnJgDnijw
Part 2:
http://www.youtube.com/watch?v=WhVVAI8drVo
Will help explain the timing etc involved in an RTO close to V1 and the possible consequences of an RTO on or after V1 - regardless of the distance available.