Personally, I think the following is an example of bad ass genius:
"Punch it"
"Sir, permission to leave the station?''
"For what purpose Master Chief?"
"To give the Covenant back their bomb."
"Shipmaster, brute ships, staggard line, they out number us three to one,"
"Then it is an even fight."
"Radio for VTOL, Heavy lift gear, we're not leaving him here"
"Yeah, you're not"
"Chief wait! The Arbiter's with us, we've got enough to worry about without you two trying to kill each other!"
"Were it so easy."
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Cortana: "I have defied gods and demons. I am your shield; I am your sword. I know you; your past, your future. This is the way the world ends."