After 80 knots - Unsafe to fly???
After 80 I am go minded and have programmed myself to abort if:
I hear the fire bell
The aircraft pulls unmistakably to the side (engine failure)
Wind shear warning
As far as unsafe to fly I can only think of two other causes:
Runway excursion (vehicle or plane on the takeoff roll)
One engine goes into reverse (this will pull to the side like an engine failure)
I would not abort for bird strikes, even multiple – only if the engine fails.
It is the Capt. that should make the RTO decision. If he/she is the first to notice a problem than he/she can just call RTO. The co-pilot should, in my opinion, give useful information, that is - various words describing the problems at slow speed. After 80 it should be restricted to engine failure or runway excursions unless it is an extremely urgent problem.