Some media depict a darker take on the Bubble Bobble series gameplay where the bubble dragons are considered "evil" with their bubble tactics. It may also be a case of Genre Blindness, but why would the soon-to-be victims not go ahead and touch them?
Bubble Memories: At the end of the happy ending, the only reason why "History repeats itself"◊ is shown is because the local people are turned into bubble dragons by an evil force, and an island rises up from the depths of the sea ◊◊◊ upon completion of Normal Mode (which are both similar to Bub/Bob having to rescue transformed people from The Alcatraz and turn them back to normal, and the three secret islands rising up when all diamonds are collected in Rainbow Islands). ◊◊
After one is cursed and transformed into a bubble dragon, once they touch even a little bit of fire or an energy bolt, they get engulfed immediately and incinerated into a pile of ash on the spot. This occurs even if they turn back into a human.