The context of the following conversation is Austin was not a very well trained dog, so when Skylar asked for a kiss, Austin bit Skylar's lower lip pretty hard.:
Austin says I think Skylar hates my dog..
The friend responds What did he do?.
Austin responds She asked for a kiss and instead of giving him one he bit her lower lip pretty hard..
The friend responds Why would he do that?.
Austin responds It just happened fast and I didn't even realize he did it until afterwards..
The friend responds That's very concerning..