I would design the batteries element with little robotic legs, so that when a thermal runaway occurs, they would disassemble and run away dispersing from the hot elements, to cool down each individually. </me mode="overengineering">
Yes, perhaps run into a house or school. Or orphanage.
lol or to your local tire storage facility.. oil refinery... nuclear power plant... lumber yard with thousands of cut trees waiting for processing... paper mill... there’s lots of good options to pick from