Unable to rest if unalerted slaughterfish are in the cell with you
When trying to rest near bodies of water, if there are any unalerted slaughterfish nearby, you are unable to rest with the "You cannot rest, there are enemies nearby" message.
(RM-3542 from redmine: created on 2016-09-10 by Jack Troughton, , closed on 2016-10-01 by R. D.)