Hello everyone,
Two points:
a) I play the Paladin involved in this tragic endeavour and
b) I think that all of you have possibly missed something in the rules
Unfortunately, I have not been at work and so have had no computer from which to correspond on until now.
Attack of Opportunity
p137 of the Players Handbook 3.5
"This feat does not let you make more than one attack for a given opportunity"
This is referring to Combat Reflexes and its effect on Attacks of Opportunity. However, it should equally and I believe is expected to equally apply to characters without the Combat Reflexes Feat.
Cleave
p92 of the Players Handbook 3.5
"...you get an immediate, extra melee attack against..."
Combining the two would seem to equate to Cleave not being allowed to be used as only one attack is allowed for a given opportunity and any cleave attempt would be considered a second attack. While technically, this would seem to cover only those with the Combat Reflexes feat, I'm sure it is meant to be a feature of Attacks of Opportunity in general.
There again, maybe I'm trying to stretch the rules. I would certainly be curious as to the board's perspective on this point.
Best Regards
Herremann the Wise