5 knots below V1/VR enormous bang.
P1 go minded and begins rotate at his V1/VR (company SOPS - doesn't have to rely on the call?).
P2 perceives imminent danger prior to his ASI hitting V1/VR and closes thrust levers.
The safe/unsafe (life/death?) decide, communicate, and act whether to get airborne or stop occurs over a period of one-banana-two. Always tricky accelerating just before V1/VR.