1.   As dying Santa Ana winds and weary crews slowed the Calabasas Fire to a crawl Tuesday, a fireball exploded and trapped six firefighters on a remote Malibu hillside.

2.   Until the planes crashed and the billowing fireballs exploded, there simply would be no knowing who would overcome their personal terror to help save others.

3.   When the two trains collided, a huge fireball exploded, fed with fuel from a large, exposed diesel tank on the Amtrak locomotive.

4.   When the MARC and Amtrak trains collided, a huge fireball exploded, fed with fuel from a large, exposed diesel tank on the Amtrak locomotive.