V1 would be somewhere near 150 knots, so 125 knots is quite reasonable to reject the TO “if you consider the A/c is UNSAFE or unable to fly”
Simple really.
He made a call, he did the right thing, they all lived……...
They were safe and in NO danger…..He’s done his job.
As they say, “better to be on the ground with a problem wishing you were in the air than in the air with a problem wishing you were on the ground”
The CN is a good guy, lots of experience and he doesn’t deserve all the “Monday morning quarterbacking”