Louis sees Bill, Francis, and Zoey getting mauled by vicious zombies.

lol well ill cut this one short:
was the answer :P

now here is the next question How would you feel and what would you do if pie could fly?

It depends on the in which it attains flight.

Does it levitate like a UFO? Has it sprouted wings like a bird? Does it have a propeller like a helicopter? Or does it use rockets like a jetpack?

Each flight method would inspire different feelings for me, so need this information.

just float. . randomly "levitate" and be able to propel itself wherever you wanted

and all you had to do to make it work is sit on the pie

what flavor of pie is it?

any flavor you want. . .apple, pumpkin, peach, banana cream you name it. .

Okay, given the pie levitates on its own, I would first remove the tin.
Upon realizing that the pie itself is flying and not the tin, I would then come across an epiphany...
"This is the most epic thing in the history of epicosity." O_O
I would then proceed by trapping it, and displaying it to passers-by in exchange for a modest monetary fee.
"The Amazing Flying Pie" That's what I'd name it, people for everywhere would want to see the pie, and boggle at what flavor it must contain.
And in the meanwhile, I would be rich Rich RICH!
But, eventually, the pie would go bad, the spectators would cease to be amazed as the pie's levitation power weakened.
And I would lose my ill gotten gains.
A few months later, I would sleep in the street as a derelict, owning nothing to my name gut the pie that had for a few brief years made me rich.
And, as the sun set, the hunger started to set in, and I would be forced to eat what had at that time become a close friend.
And so there I was, weeping as I was eating, for the loss of this friend was to much to hold in.
And then I thought, "Gah! Shit, this isn't pie at all! It's a fuckin' rancid pizza!"

Yeah, I felt like typing something long-ish, I don't care what you think about it. XD