So far I have to say I'm really enjoying this series.
I do like the Touma character, though I think they could tone him down a notch. Just a bit too much pathos there at the end over Index's situation
As for him surviving that fall and knocking out the other guy with one punch, I see it as just your standard action hero schtick. How many times have you seen <insert action movie star here> take enough punishment to kill a normal person 5 times over, then get up and punch somebody's lights out?