Or more importantly: when don't they?
I've googled many threads, including in this forum, that claim that Shields become dead weight when combined with any weapons that require two hands. I'm scouring the BRB for anything that would support that claim, but I can't find anything.
The BRB reads:
"If a model carries a shield, the score it needs to save is reduced by 1"
It doesn't say "except when the model also carries a Halberd, additional Hand Weapon, Great Weapon, etc." In fact, you don't even need a free hand to use a shield, because - both IRL, and on Warhammer artwork - shields are fastened to the forearm. Why do so many people believe that you lose the 6+ Armour Save when you combine the Shield with, say, a Halberd? What passages in the BRB support that opinion?
Please note that I'm not asking about Parry Saves. The BRB is very clear about when a Shield grants you a Parry Save, and when it doesn't. I'm strictly asking about Armour Saves.