For initial t/o briefings, I don't like the "prop, engine, system, or load" thing. Just say "reject" and tell me in plain English what you see, and I'll make the decision. Example: I'm on the bunk, gray-haired EP is in the right seat, young LT in the left...TIT gage slips out on t/o roll and is hanging there, and only the EP sees it. Gray-haired EP calls reject. Young LT does the right thing and pulls throttles to flight idle, waiting to hear why. Gray-haired EP stares at gage thinking, "is this a prop, engine, system, WTF is this?" What seems like thousands of feet of runway go by. An example of an experienced dude trying to think too much because we tie our hands with the standard briefing and try to put rejects into a category. As SOF HERK says, there are very, very few situations that call for a shutdown in flt idle anyway. Make it simple and just call what you see....as if it's a t&go, but with the "reject" call.