Problem: Continue the following story.

The doctor was able to cure Natalie and not Cynthia as 
Here's how I want to continue it: Cynthia had late signs of her disease.

Problem: Continue the following story.

Abby forgot to put her towel in her gym bag so she used a washcloth to dab her sweat, because the 
Here's how I want to continue it: washcloth was available.

Problem: Continue the following story.

The floor could not withstand the cat's scratches, but the wall was unscathed, since the 
Here's how I want to continue it:
floor was vulnerable to them.