Haha, thanks :)

As far as the punishment for double producing, it is an easy way for a witness to loose witness votes. It is pretty easy for other witnesses (and anyone else who is running a node) to detect it, as it shows up in everyone's logs.

The majority of the time, it just ends up with a "micro fork" - which is basically a fork that lasts one block. As soon as it is the next witness's turn, they pick one of the blocks, and everyone follows. While it is still possible for someone to get tricked in this short period of time, it is a fairly common practice in cryptocurrency to at least wait a few block confirmations before considering something "final" - which should protect against this as long as users/apps are following this best practice. (Some still might not though, which is why it is still best to avoid even a micro-fork as much as possible.)