User blog comment:HanataSanchou/782 - The Suicide Snot Bomber/@comment-10543621-20150404042209

The Buso didn't work because Trebol wasn't immune to attacks due to being a Logia, but simply because he's really skinny and the rest of his mass is entirely made up of the goo. Luffy's punches were just missing him altogether. From what Trebol has said, he's likely not even a Logia. Probably a paramecia like Mr 3 and Magellan.

As for the other instance of Buso not working in terms of Sakazuki, I don't think any of the Buso based attacks used on him didn't work. He probably just countered them with his own Buso, which could very well be superior to those used by his opponents (other WB captains). Whitebeard clearly damaged him well enough since presumably Whitebeard's own haki would definitely be superior.

The executives did not witness Doffy killing Homing. All that was done before he even met them I think. The part about him escaping from Mariejois was probably after he tried to bring his father head back to be reinstated as a World Noble.

The people in the town did not get uneasy. That was just the dwarves saying their hearts felt lighter in unison while looking towards the palace. This was probably because Trebol got beaten. A mangastream staff member explained that the sound Trebol made as he was cut 'Pigyaa' was the same sound he was mocking the Tontatas of making while he was squishing them back in the underground port.

As for how Law is gonna survive the point blank explosion, the general consensus speculation would be Sabo showing up and using his flame abilities to shield Law, and probably Luffy as well.