Greenfield
Adventurer
Free actions can't be taken out of turn. You're thinking Immediate Action.
So you can attack with the bonus then switch to defense this turn. Next turn you can switch back to offense and attack, but now you're locked in Offense mode, since you can switch "on your next action" not "at will".
Now, technically, you could switch at the beginning of your turn, since that's the start of your attack action, then full-round attack, then call your free action "your next action" and switch it again at that point, but if I were DM I'd cast a Dispel BS on that one pretty quickly.
So you can attack with the bonus then switch to defense this turn. Next turn you can switch back to offense and attack, but now you're locked in Offense mode, since you can switch "on your next action" not "at will".
Now, technically, you could switch at the beginning of your turn, since that's the start of your attack action, then full-round attack, then call your free action "your next action" and switch it again at that point, but if I were DM I'd cast a Dispel BS on that one pretty quickly.
