A hammer with loosely fitted handle will

Long enough to make the chest rise

Rescue breath needs to be long enough to make the chest rise.

Cocoa butter

Greasy ointments (like butter or cocoa butter) on top of a burn will retain the heat of the burn, slowing down the healing process. This is why we recommend immediately running a burn under cool water. Additives in these substances, such as fragrances in cocoa butter, can also be irritating to the skin.