[Zapmeister]

A logical conclusion might be that if you leave you wiz without guards, it is just the same as leaving him without the right spells. A careless oversight. A fatal one no doubt. Does the A.I. really need to compensate for human oversight?

It's not an oversight. You need to give your mages appropriate army-combat spells if you want them to participate effectively in army combat. The problem is, there's no way of telling them how to behave differently if they are subject to assassination attempts in the same turn.

The whole assassination thing is a bit cheezy, though. I mean, what kind of assassin does his job by charging at the victim from the other end of a battlefield? To do it properly, you need a model completely separate from the one used for army combat.