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If my character falls through a square threatened by an opponent does it provoke an attack of opportunity?

For example:

My character is on top of a cliff being chased by an angry drider. My character falls, passes through the driders threatened squares on the way down. Does this provoke?

I'm looking to run a session with a mass battle as a backdrop for the events going on with the party, but I'm running short of ideas for encounters. I don't want the entire session to be constant combat, I'd like a few encounters to be resolved via skill checks and roleplaying.

For example: The characters come upon a group of NPC's trapped within a burning building, and need to figure out a way to get them to safety.

The scene is the PC's have arrived with a caravan to a Grippli village in a vast jungle. The village is empty, the inhabitants having been slaughtered in a Tsathar (evil frog men) attack. The Tsathar have hidden themselves in a now fetid lake and wait for nightfall to attack anyone foolish enough to investigate.

The PC's are level 5.

I actually found really good use for Beast Form by using it on my familiar. I'd taken Improved Familiar and gotten a Fairy Dragon familiar. Fairy Dragons start with a 9 strength (which is pretty amazing for a create the size of a cat) and since they are tiny, the polymorph rules state you need to adjust them to small before you polymorph them (for an additional +4 str). The bonus from Beast Form gives them another +2 to +4 bonus on top of that, giving them a decent strength score.

The Fairy Dragon (now in the form of a tiger usually) can use Improved Invisibility three times a day, which means it catches most opponents flat footed and gains another +2 bonus to attack rolls. Put it into a flanking position and add some random buffs and you've got a pretty good damage dealing option, while your wizard is free to continue to buff/cast/whatnot.

Thank you, so using extracts follow the rules for drinking potions, not for spell casting. I was very confused.

The Alchemist class confuses and frightens me. Perhaps some of you nice people can answer my questions:

1. Is using an extract the same as casting a spell? For example, if you provoke an attack of opportunity while using an extract do you have to make a concentration check? Can you use an extract "defensively" to avoid provoking?

2. What kind of action is it for another character to use one of your infusions? Can a character (who isn't an alchemist) draw and drink an infusion as a standard action?