Concept:
- Idioms should never be read literally, they carry a fixed figurative meaning.
- 'Flew off the handle' means to suddenly become very angry.
Step 1: Recall the meaning of the idiom
'Flew off the handle' describes someone losing their temper suddenly and without much warning.
Step 2: Eliminate the literal-sounding options
'Flew away from there', 'threw away a handle' and 'opened the handle and ran away' are all literal interpretations of the words, which is exactly the trap idiom questions set, they are wrong.
Step 3: Match with the figurative meaning
The trainer reacting badly to a simple question about data reliability fits with him suddenly getting angry.
Final Answer: lost his temper