Well, in all seriousness. I didn't know (from the Spoilers) that Luffy kept trying to attack and save everyone. When I read the chapter and saw his futile attempts time and time again, only to break down at the end crying ~~ that was where everything hit. It wasn't as emotionally impacting as the Funeral for Merry chapter, but it definitely moved me. The last page just leaves you sitting there shocked.
If I may make a contrast that was what I really liked about the chapter: I love it when the good guys have a complete defeat moment in a story. Problem is, it usually is mildly disappointing at the same time because the good guys escape death and complete destruction because the bad guys either underestimate them or are too soft etc. Essentially there is rarely an explainable escape outside a jet shows up or someone saves them and escapes. Either way, hard to write in a convincing and satisfying manner. This one, to me, tops them all giving us a complete defeat, a mysterious and questionable escape, and leaves us wondering "what happened, and where are they!?"
The contrast would be Naruto vs. One Piece. In Naruto, I was enjoying Sasuke getting batted around last week and was hoping he would actually take a crushing defeat for once. In One Piece, I was crying and wondering how they were going to escape while my head was exploding over Zoro getting puni'd to fantasy land. This week Naruto reveals, "whoops, Sasuke wins again!". This week One Piece reveals, "WHAT!?!? They all get crushed, then scattered, and then Oda leaves us clueless!? What should I do? I cannot go on living!!!"
Ok, maybe I went overboard. A little. Maybe. I like Naruto however much it irks me at times; same goes for Bleach, with the same irkiness. (Among other Manga of fair to equal popularity). But the comparison should still be valid, yes?