diff --git a/tests/Aetheria.Shared.Tests/ContactRevealTests.cs b/tests/Aetheria.Shared.Tests/ContactRevealTests.cs
index c5b3ced75..acf064dfc 100644
--- a/tests/Aetheria.Shared.Tests/ContactRevealTests.cs
+++ b/tests/Aetheria.Shared.Tests/ContactRevealTests.cs
@@ -1517,11 +1517,13 @@ public sealed partial class ContactRevealTests : IDisposable
         Assert.True(lapsed, "fixture: the bearing lapsed");
     }
 
-    // The memory window is exclusive: at Zone.Time - freshest == BearingMemory the bearing has lapsed, and for a subject that
-    // has departed the book drops it (and the stance with it) on that tick. The sighting is on a coarse float time (.5) so
+    // The memory window is exclusive: at Zone.Time - freshest == BearingMemory the bearing has lapsed (Detected, whether the
+    // subject stays or departs), and a departed subject's book entry (and the stance with it) goes on that tick. The sighting is on a coarse float time (.5) so
     // that freshest + memory is representable and a step can land on it exactly.
-    [Fact]
-    public void TheMemoryWindowIsExclusiveAtTheEquality()
+    [Theory]
+    [InlineData(false)]
+    [InlineData(true)]
+    public void TheMemoryWindowIsExclusiveAtTheEquality(bool departs)
     {
         var e = Add(float3(0, 0, 100), new[] { "Gun" });
         var o = Add(float3(0, 0, 0), new[] { "Eye" });
@@ -1533,7 +1535,7 @@ public sealed partial class ContactRevealTests : IDisposable
         Assert.Equal(.5f, freshest);
         ShowOnly(e, 1f, gun);
         Assert.True(e.Visibility * o.PassiveInfo(e.Position.xz, 1f) <= _items.GameplaySettings.TargetDetectionInfoThreshold, "fixture: unseen");
-        _zone.Remove(e);
+        if (departs) _zone.Remove(e);
         var memory = _items.GameplaySettings.BearingMemory;
         for (var i = 0; i < 1000 && _zone.Time - freshest + .3f < memory; i++) Tick(.1f);
         Assert.True(o.RememberedHostiles.Contains(e), "fixture: still listed");
@@ -1552,8 +1554,11 @@ public sealed partial class ContactRevealTests : IDisposable
         Assert.Equal(memory, _zone.Time - freshest);
         Assert.False(o.RememberedHostiles.Contains(e));
         Assert.False(o.ContactOf(e).Detected);
-        Assert.DoesNotContain(e, o.RevealedSubjects);
-        Assert.False(o.IsHostileTo(e), "the book dropped the departed subject at the edge, and the stance with it");
+        if (departs)
+        {
+            Assert.DoesNotContain(e, o.RevealedSubjects);
+            Assert.False(o.IsHostileTo(e), "the book dropped the departed subject at the edge, and the stance with it");
+        }
     }
 
     // A stance lasts the sitting: a hostile still in the zone whose every revealed item the observer perceives destroyed