1.72. She grabbed his ring, pulled on it, and dropped
it. (JM, from Math for Girls)

1.72 answer: They were skydiving. He broke his arm as he jumped from
the plane by hitting it on the plane door; he couldn’t reach his ripcord
with his other arm. She pulled the ripcord for him.

1.72 variant answer: (sketch) The ring was attached to the pin of a
grenade that he was holding. Develop a situation from there.

1.72 variant answer: The ring is the engagement ring that he gave her.
She’s calling off the engagement. (JD)