Touma never planned anything because he didn't have the information to plan anything. It was either an unexpected fight, or an unknown situation.
He is supposed to be quick-witted, being able to come up with a plan the moment he realizes something. This has been shown in all of his other fights.
This time, he completely wastes a good opportunity. Making the opponent underestimate you is part of strategy, not luck. If he managed to beat the shit out of Accelerator when he slapped the hand away, the experiments should cease.
I know I am being picky, but it could have been done much, much better so easily that I am irritated why they had to present it in such a manner.
@Xelbair - That's true. If accelerator steps on the ground and changes the speed enough that it can destroy the earth, and adjust the recoil to his body towards the ground as well, the planet would be destroyed twice over.