If a monster surfaces and then submerges again in the same turn then give the

message "The monster surfaces briefly" instead of "The monster surfaces", so the player will have some idea as to why the monster isn't in view.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@8647 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on January 21, 2009
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