source 1:
http://club.pchome.net/thread_1_15_5008571__.html
source 2:
http://www.narutom.com/news/10218.html
source 1 was more detailed but source 2 has some additional information about the key getting knock off, mr 3 helping and sengoku becoming a big buddha. generally the story line appears to be consistent.
Chapter 571: execution platform
luffy vs garp
garp : if you wanted to pass then beat me up
luffy : grandpa.... 2nd gear!
luffy punches, garp jumped and avoided the punch.
luffy kicked in mid air and garp got hit by it, lost his balance and fall down from the bridge.
garp's expression seems like he let luffy hit him (poster's opinion)
luffy finally arrived at the execution platform.
luffy : ace, i am finally here. use this key to open the lock.
ace : thanks luffy, where did you get that key from?
kizaru : it would be troublesome if it was unlocked.
(from source 2, i read that the key was knock off by kizaru)
MR3 appear on the platform disguised as the executioner.
luffy: ah litte 3, you are good, how did you get up here?
MR3 : i will tell you later, lets save ace now
(on source2, it seems MR3 is responsible for creating yet another key with his candle)
luffy : what happens?
a shadowed figure appeard behind MR3.
ace : supreme admiral.
pirates : damn, sengoku has joined the fight
sengoku: ace must stay here
sengoku started his attack toward luffy.
(on source 2, by turning into a big buddha)
luffy cs avoided the attack but the execution platform crumbled.
all 3 fall down
luffy : ace, the lock, quick unlock it.
marine: everyone fire (i think this is toward luffy cs)
and a flame is seen where luffy cs got fired at, luffy and ace shows up, mr3 is half dead
end
edit: got the chapter title wrong. edited to fix it
