Why may “during hardship” function as tatmīm rather than iḥtirās in “he treated his friend well during hardship”?

Supplementary Practice 7: Editing Expressions, Weighing Context and Rhetorical Critique

• It explicitly invalidates the earlier statement
• It usefully completes the account of kindness rather than primarily blocking a mistaken inference
• It is an unrelated oath response
• It necessarily changes the statement to an interrogation