1 files changed, 10 insertions, 1 deletions
diff --git a/crawl-ref/source/spells4.cc b/crawl-ref/source/spells4.cc
index 9c57589680..2fe715a0f1 100644
--- a/crawl-ref/source/spells4.cc
+++ b/crawl-ref/source/spells4.cc
@@ -2034,11 +2034,17 @@ bool cast_twist(int pow, const coord_def& where)
     if (invalid_monster_index(mgrd(where)))
     {
         mpr("There is no monster there!");
-        return (false);
+        // This counts as a real cast, in order not to leak invisible
+        // monster locations, and to allow victory-dancing.
+        return (true);
     }
 
     monsters& m = menv[mgrd(where)];
 
+    // Identify mimics, if necessary.
+    if (mons_is_mimic(m.type))
+        m.flags |= MF_KNOWN_MIMIC;
+
     // Monster can magically save vs attack.
     if (check_mons_resist_magic(&m, pow * 2))
     {
@@ -2055,6 +2061,9 @@ bool cast_twist(int pow, const coord_def& where)
     // Inflict the damage.
     _player_hurt_monster(m, damage);
 
+    if (mons_is_mimic(m.type))
+        mimic_alert(&m);
+
     return (true);
 }