I'm afraid there isn't much context to this one (sorry!) but that's what I have to deal with as well. I'm doing subtitles for this program about animal rescue workers, and at the beginning there are short extracts from previous episodes. There are a few police cars parked on a street and a few animal rescue workers and police officers are talking to each other on the street. One of them says to the others: "I'm afraid they're already bubbling so just be warned." (The spelling is based on script, but it's not very reliable) then the scene ends there. Now, if you would have ANY suggestions, I'd be thrilled. Thanks in advance!