Bava Metzia 36: When a Guardian Hands Off to Another Guardian

When a guardian transfers the item he's watching to another guardian, without the knowledge or permission of the owner. Plus, a story about an elderly woman who watches the gardener's hose - how long does it take to establish trust for a second shomer? Also, a guardian who loses an animal, which then dies of natural causes. Is the guardian responsible for paying? It's a clear and clean dispute between Abaye and Rava.