I agree with all above.
For info in our company an FO can decide to abort the take-off in specific circumstances.
There are 5 mandatory stop reasons during T/O:
Any Fire Warning;
an engine failure confirmed with at least 2 parameters;
a take-off Config warning;
"Windshear Ahead" warning or a
"Monitor Radar Display" caution (which is also windshear detected in the initial take-off path).
Any of those pop up and either pilot will call "stop"
Plus, if the FO is the handling pilot he may also call, and perform, the RTO if he/she has serious control difficulties or there is an obviously blocked runway.
Anything else happens and the FO will clearly state the problem and the Captain will respond with "Stop" or "Continue".
If the FO is handling they will perform the RTO down to a slow speed (or to a stop if the capt prefers) at which point the captain will take control.
I hope that's of help / interest.