Keep defender-victim opinions as allies after a quarrel.

The clash penalty applied to every pair except defender looking at the victim, so the person being helped disliked the defender like a second enemy.

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/HSchool.Simulation.Tests/QuarrelFightTests.cs

@@ -230,6 +230,34 @@ public class QuarrelFightTests
         }
     }
 
+    [Fact]
+    public void Defender_AndVictim_OpinionsMoveAsAllies()
+    {
+        var (school, pupils) = ThreePupilsOnBreak();
+        using (school)
+        {
+            var bully = pupils[0];
+            var victim = pupils[1];
+            var defender = pupils[2];
+            OpinionStore.Set(bully, victim.Id, -55);
+            OpinionStore.Set(victim, bully.Id, -55);
+            OpinionStore.Set(defender, victim.Id, 70);
+            PlaceAt(school, bully.Id, "corridor-1");
+            PlaceAt(school, victim.Id, "corridor-1");
+            PlaceAt(school, defender.Id, "corridor-1");
+
+            Assert.True(school.TryStartAction(bully.Id, TalkActions.Quarrel));
+            TickWhile(school, personId => ActivityOf(school, personId) == TalkActions.Quarrel, bully.Id, victim.Id, defender.Id);
+
+            Assert.True((OpinionStore.Get(defender, victim.Id) ?? 0) > 70);
+            Assert.True((OpinionStore.Get(victim, defender.Id) ?? 0) > 0);
+            Assert.True((OpinionStore.Get(defender, bully.Id) ?? 0) < 0);
+            Assert.True((OpinionStore.Get(victim, bully.Id) ?? 0) < -55);
+            Assert.True((OpinionStore.Get(bully, victim.Id) ?? 0) < -55);
+            Assert.True((OpinionStore.Get(bully, defender.Id) ?? 0) < 0);
+        }
+    }
+
     private static (School School, Person First, Person Second) TwoPupilsOnBreak()
     {
         var (catalog, map) = Vanilla();