User blog comment:Woohoot/Things that totally could happen, but won't cause... Manga.../@comment-5780397-20150522102423

The Colosseum fighters have just been healed, perhaps they will converge on Doflamingo later on, but, for the moment, they prefer to keep the civilians safe. After all, it sort of makes sense that they do not want to swarm him, he might just run away and wait for the Birdcage to finish them off.

Riku said that Mansherry cannot use her powers too many times. Losing an arm is quite the shock for your body, and I think that even though Law was healed, his stamina was not replenished, due to the extensive usage of his powers. Besides, thinking realistically, it is impossible to coordinate that many people in such a chaos.