So basically it steals your shares and pays you a fraction of what you would normally get because you had to shut down? Who gets the reward from those shares? Kind of messed up but good to know.
I think it redistributes them to everyone else who stayed online during the entire round.
Look at this post. Shares at the beginning of a round have less value then shares in the end of a round.
https://bitcointalk.org/index.php?topic=1976.msg50002#msg50002