[Edi]

Chris, that's not a bug, that's WAD. If units have unactionable orders, they do something else (e.g. a mage scripted to cast something that doesn't have enough range to reach enemy, he casts something else instead). If there is nothing else they can do (essentially can't shoot or can't cast a spell), they move on to the next order in the script, check if it's actionable etc. If the oreder is retreat, it's triggered. If retreat orders are not specified in the script, the default order is attack if nothing else can be done.

Argitoth, the golem issue is in the bug list with a request for clarification on whether it is a bug or working as it should. Without input from IW, that's all I can do.