Communion Master slows you down ?

[Zooko]

I have a Celestial Master with Heroic Quickness +103%. His base move is 12 and his current move is 36, which means he should get 3 moves per battle round. Indeed he does -- in the first round of the battle he casts three spells, one of which is Quickness. Quickness apparently gives you "whatever your base move is again, and one action per battle round". My Celestial Master's move went up to 48 and he got four spells in battle round two. In that round one of the four spells that he cast was Communion Master. After casting Communion Master his move was still 48, but he cast only two spells per round for the rest of the battle!

I suspect that Communion Master somehow throttled him back to the speed of his communion slaves (none of whom had Heroic Quickness +103%), but let him have his +1 move for Quickness.

Is this a bug?

It wasn't that he was fatigued -- his fatigue was nice and low throughout the battle.