It was an honest mistake thinking Matthews could have hurt his hand again. With the broadcasters talking about a potential injury, Leaf fans panicked before learning what had actually happened - being that the puck simply struck Matthews in a sensitive area.
The interaction between Keefe and Bunting seems like a non-issue based on both of their comments, and it shows how easily things can be blown out of proportion. Nonetheless, even if there were issues between the two, I'm sure they'd be dealt with privately and that the media would not be privy to it.