Ah, I forgot he was distracted. But that does prove that he has momentary lapses of power that the trio can exploit.
Nevertheless, he still gets plastered against the wall by Palpatine in the comic: http://2.bp.blogspot.com/iYJy7acQmpHnp8VcbizECOGAw5bp0LYuwzxyU9k5KUWP8w6gVDzwS6xeCR2eSOdM_yKSw612p5Ni=s0
And I'm still waiting on proof that he suddenly matched Sidious in Force power.
Yoda caught Sidious off-guard with the Push, it seems.
Reciprocating Force Speed (if that interpretation's correct) doesn't mean reciprocating, say, telekinesis. And it could well just be that the substantially increased "darkness" within Mace would've naturally proven an amp for him due to the properties of Vaapad, which would've made him fast enough to fight Sidious anyway.