With no explanation, label text_A→text_B with either "strengthener" or "weakener".
text_A: A man in a leather apron who appears to be a blacksmith holds up a glowing hot piece of iron which he is working on with the hammer in his right hand, the forge fire conspicuous in the background. A man is forging a sword for the elves.
text_B: The man mumbles to himself 'If I don't make this sword the giants will kill me'
weakener.