Do yall have anything better to do other than argue about manga? One click to the comments and I'm greeted with 8th grade argumentative essay assignments.
@SGR
I think they're just whispering to each other and the artist failed to use the correct visual indicators to notify the readers of it, making it seem like they're using telepathy with the thought bubbles. I may be wrong, but that's the only plausible idea I could come up with.