This skill allows you to channel your chi more effectively when making an attack. Whenever you are making an attack roll immediately after drawing a weapon and your target is flat-footed, you may make an Iaijutsu Focus check as a free action. The results of the roll determine the amount of additional damage done, as shown on the following table: 10-14: +1d6 15-19: +2d6 20-24: +3d6 25-29: +4d6 30-34: +5d6 35-39: +6d6 40-44: +7d6 45-49: +8d6 50+: +9d6 This damage is not cumulative with sneak attack damage or similar abilities if your character has them.
Action: Not applicable; Iaijutsu Focus checks are made at the beginning of a surprise round or as part of an attack, and are therefore not actions in and of themselves.
Retry: Against inanimate objects, yes. In a formal duel or combat situation, generally not, unless the requirements for using the skill (sheathed weapon, flat-footed opponent) somehow come about again.
Special: You may also use this ability when making an attack against an inanimate object. This is the technique martial arts masters use to break boards or bricks with their bare hands.
If engaged in a formal iaijutsu duel, you may use your total Iaijutsu Focus modifier in place of your standard initiative if it is higher.
You gain a +2 bonus to Iaijutsu Focus checks if you have 5 ranks in Balance.
So if I read this right, you should be able to charge a flat-footed opponent, and then use Iaijutsu Focus as apart of the charge attack. Since you can cast a spell of standard action or faster and charge, you could channel a spell, charge, and then do the Iaijutsu Strike, if I am reading this all right.