One of my BBEGs I think is going to specifically design a spell that let's him do this. It essentially lets minds in the area go extra fast, but only as long as the caster is telepathically communicating to them. So he can cast it, monologue a bit, and then fight. The only problem is that it requires an extremely genre aware person to do this. So my current justification for why they'd have the spell is that it allows quick in combat tactical conferences with your people.