If you were to thoughtlessly go to the basement right now and let the mouse out, the next day you'll hear Aisha idly grumble [I found a weird dead mouse this morning], two weeks later you'll be told [A cat infected with magic stone disease was discovered], and right after that Roxy will come down with a fever. And it will be 30 years later before you connect everything together."
"...What happens to Roxy?"
"She dies.