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A character has moved (as observed by his enemy), and stops to cast invisibility, and is then subsequently the victim of a Grease spell and fails his save and falls. His enemy moves in to take a swing with a 50% miss chance. On his next turn, the Invisible Grease victim wants to crawl away (essentially making a 5 foot step to crawl as a move action) to get out of the area of the Grease spell....does his enemy get an attack of opportunity?
Likewise, does crawling through Grease negate the need to make an Acrobatics check?
Don't forget this rule:
You can't execute an attack of opportunity against an opponent with total concealment, even if you know what square or squares the opponent occupies.
Invisibility gives you Total Concealment, so nobody can take any AoO against you.
As for crawling through the Grease, there is no RAW to support it, so initially I would say the DC to crawl is the same as the DC to walk at half speed.
However, the GMis always allowed, even encouraged, to apply situational modifiers to any checks as a GM Judgment Call. I could easily see reducing the DC by 5 for crawling.
Crawling: You can crawl 5 feet as a move action. Crawling incurs attacks of opportunity from any attackers who threaten you at any point of your crawl. A crawling character is considered prone and must take a move action to stand up, provoking an attack of opportunity.
So yes, you can avoid the check by crawling since you never stand up while you move. (See the Movement section of the Combat section for this rule).
[D]oes crawling through Grease negate the need to make an Acrobatics check?
I would say no. I could see applying a circumstance bonus to the check. However, considering that you move at 1/2 speed in the area of effect of a grease spell. The move should require a full round action (Move 5 Feet through Difficult Terrain). So, I might just call it a wash and say you still need to make the check but it only costs a move action if they make the check.
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Here is how I will rule it then:
Crawling 5 feet is a move action in normal terrain. So, in order to crawl through Grease (difficult terrain) at 1/2 speed, it will require a full round (figuring 2.5 feet per round) and a DC 10 Acrobatics check (per move action) to move 5 feet.
So, if a character is prone in the Grease and wants to crawl out of it (a 5 foot move), they will have to make a DC 10 Acrobatics check (as a Move action) to crawl 2.5 feet. Repeat the process again to end the turn prone in the adjacent 5 foot square. Likewise, if he succeeds on his first attempt, but fails the second, he will only need to make one successful attempt the following round to get out. He could then use his remaining Move action to stand up.
I think that is a reasonable ruling.