FireLance said:
Now, suppose it is possible to Cleave off an AOO. Your ally provokes an AOO and your opponent drops him. He then attacks you, gaining a fourth attack against you in this 1-round period. Where does this extra attack come from? The loss of an ally in itself does not normally create any additional gaps in your defence.
I beg to differ on this comment.
Having an ally gives several advantages, one of which is have someone else cover a hole in your defense. This allows you to focus your own defense and attacks to other circumstances.
If your ally is taken down, and he was 'covering your back', a huge hole in your defense has just been opened.
The attack roll from the Cleave can signify how exposed you are to this new situation (being an attack at the opponents highest attack value). The attack roll can also be used to signify how quickly you adapt to the new situation.
NOTE: In IMC, defenders roll for defense, instead of just adding 10 to the relivant modifiers. This could be why my point of view diverges so greatly from yours. I have to explain to players what happened in combat, and why they achieved high or low scores on attack OR defense.
Now suppose this is not the case, that your ally is on the opposite side of said opponent. This would a case of 'guile and trickery will beat enthusiasm every time...).
You approach the opponents rear, seeing him taking an AoO on the ally on tyhe other side (say 10 feet away). Now IMHO, an attack from an AoO will look like most other attacks...
Anyway, he attacks your bud on one side as you approach his rear from the other. Lo ane behold, he knew you were there!! Not only did he get your friend, he got you to walk into the strike path as well...
