Given the task definition and input, reply with output. In this task, you will use your knowledge about language (and common sense) to determine what element the marked number refers to. The numbers are marked with two underlines around them, like: _ number _. Your answer should be chosen from the given text, and should not contain other words.

Al Burns:  Please tell me why we just released a killer ?
Carrie Wells: We did n't , but we 're about to catch _ one _ !

killer