Should returning be overridden at all?

[Archonsod]

I think it should be capable of being over ridden, same as any other spell. One of the things I like about Dominion's combat system is the way the scripting works as more a "suggestion" than orders. It adds a bit more character to otherwise generic mages to see one get a bit over confident in his abilities and decide he really can take on the entire army by himself.

Besides, you can always force the effect through items if they're that important.

[Xietor]

Returning should be overridden at times yes. What if your pd uncovers a scout? And what if the only thing you fear is a magic duel. In this case the AI is doing its job in not making you retreat to a scout.