Flying Kick says some things that, to me, contradict each other…
The monk leaps through the air to strike a foe with a kick.
Well ok, that I understand.
Before the attack, the monk can move a distance equal to his fast movement bonus.
Notice the "Before the attack".
Side question: What's my fast movement speed? So far I only dealt with 5-footsteps, normal movement (1 time my speed) and double movement (2 times my speed)… ?
This movement is made as part of the monk's flurry of blows attack and does not require an additional action.
Okay, so basically my "Full Attack" action now encompasses moving AND attacking with Flurry of Blows. Neat.
At the end of this movement, the monk must make an attack against an adjacent foe.
Okay, sure. I can't use it to "just move". Fair enough.
This movement may be between attacks.
Wait, what? Didn't it say "Before the attack" above? How does this work?
Does it mean I can freely move between my Flurry of Blows attacks? Like: Attack A, move to B, attack B with 2nd Flurry attack?
And what about when I get more than 2 attacks. Can I split the movement up, like "Attack A, move 5 feet, attack B, move 5 feet, attack C?"
This movement provokes an attack of opportunity as normal. The attack made after the movement must be a kick.
Why does it matter that the attack must be a kick? I'm playing an unarmed Monk, so why is this specified?
Best Answer
A Full Attack option is (usually) compromised of several attack rolls, or individual attacks, which takes the entire round (6 seconds) to complete. As noted in the description of a Full Attack (emphasis mine):
This means that the "Before the attack" refers to the attack roll which you want to use Flying Kick with. So, yes. Starting Flurry of Blows with attacking A with one attack, then using Flying Kick to move to and attack B with the next attack, is what this ability does.
The Fast Movement Bonus is the bonus to your speed, as listed in the Monk level table. Meaning at third level you can move up to 10 feet, when using Flying Kick.
The reason why it specifies that this attack must be a kick, is for two reasons:
As for the movement bit being broken up. It states that the monk can move up to that distance. Meaning if you move only some of the Fast Movement bonus distance, you won't get the rest as "extra movement" later on.
Effectively the movement stops when you hit something, as in real life. ;)
Lastly, the multiple attacks bit. From the description of Style Strikes (emphasis mine, again):
So only at level 15 can you use Flying Kick twice in a round, but you can move up to the full distance for both of them.