Rezo not only hears that explosion of flame, he can even feel the heat from all the way on the sidelines. The fireball is as potent as it is unexpected, and the silence after it burns out attests to its effectiveness.

Rezo makes his way forward and prods the corpse with the bottom of his staff. He wonders how viable it would be to take this or other dead voidblobs back to the train for dissection. Probably not at all, sadly.

Once he’s assured it’s definitely dead, Rezo turns to Wash.

“Why didn’t you do that earlier?” Rezo’s tone is one of genuine curiosity, not accusation; though it’s up to Wash whether or not he takes offense to it.