Geron Raveneye said:
Okay, now you've managed to completely confound me, to be honest. What exactly do you want a justification for, and from what angle?
And I can already tell you, if you want one from the angle of "real life combat", I'm the worst person to give it, because I never had any close combat training, and never was in any serious close combat in my 32 years on this planet.
So..what exactly are you asking for?

You're clearly not asking for a moral justification, as in "when is it okay to kill an ally to gain an advantage". If you're going for a "what exact maneuver enables me to kill somebody close and thus get a shot at the enemy", I think I've tried to provide something in that area...maybe not the best, though. The Cleave feat allows for an extra melee attack, it doesn't specify exactly how it has to look, so if I "finish" my killing stroke against the rogue's apprentice by attacking my opponent, that's an AoO+Cleave maneuver if I do it "out of turn". And the shot wasn't necessarily lined up. The poor boy could have simply crossed my threatened area while sneaking up on my opponent. The same goes for the summoned creature.
As for any other points, I really have to ask you to specify a little more on what you are looking for.
Sorry, I should clarify.
I would like an example of how intentionally killing an ally will give you an extra attack against an enemy, out of turn. In my example of hitting an enemy to get one on another enemy via an AoO(roughly out of turn), I used:
*Fighter hits opponent in the leg (inner thigh), dropping him.
*He goes into an upper defense (or what ever you choose to call it), since the upper body was exposed in the low strike.
*While going into a defense, the blade lines up into a thrust against opponent #2.
*seeing an opening, he thrusts in...
Something along this line...
Then I'll try to apply it to the 'Summoned Creature to gain the AoO/Cleave' model and see how it stands up. 'Does the tactic you present justify or explain this action' type of thing.
In you weasel example: 1) did it actually give an extra attack, since you attacked on that vector anyway? 2) Was it really in the way, since you attacked it on an AoO (as it got within your reach, not the enemies)
As for your apprentice model, it hold up. Don't like it morally, but it does hold up as a 'hit off turn' tactic. How it applies to the Summoned critter model: Critters are ordered to make the attack (or it is assumed that they will) and generally aren't that close when you attack them(you attack as they pass within your reqch, not when they are attacking the enemy). The player is capitalizing on it, and knows what to expect (yes, you can argue that the character does not know, but the player still does. that is way the player had said 'character' act the way that it did). The apprentice happened to be an available target. This is doable.
In my experience, striking an ally to gain an extra, faster attack is generally impossible since, if attacking the ally gave a extra attack, then you had a clear shot anyway (and the direct path would be the fastest). Then again, this doesn't account for initiative rolls.
Guess that's where the '...seeing his friend sundered in such a manner, just a hair's breathe from completeing his own blow..." type storyline come into play.
