Some swarms like a gentle shake, some don't care what you do. By any chance did you get a feel for their temperament before you shook them? I tend to be much gentler with the runny ones, those are the ones that can be dry or just ill tempered.
Harder to see at night as well, easier to smoosh a few and get that alarm pheromone going.
Likely they have settled down good by now and soon to be friends.
...JP