The bridge exploding, two people clearly spotted dying in the air.

"Rebecca Umegruff walked as slow as ever across the humungous bridge which connected from a bit of the grounds to the school. BOOM! Umegruff turned around, it sounded like something exploded. SPUCK! SPUCK! SPUCK! TSP! BOOM! The bridge collapsed and Rebecca fell into the huge cliff, presumably dead."
—The possible death of Rebecca Umegruff.

The Explosion of the Bridge was the first conflict of the Battle of Milkenshland. It was when John Elfratte ordered Harold ForHenry and a Cigam member to explode the Main bridge - so that enemies couldn't get in, and had to take another way.

Rebecca Umegruff presumably died in this event.