diff --git a/SVSim.BattleNode/Sessions/BattleSession.cs b/SVSim.BattleNode/Sessions/BattleSession.cs
index e6d209b..c849257 100644
--- a/SVSim.BattleNode/Sessions/BattleSession.cs
+++ b/SVSim.BattleNode/Sessions/BattleSession.cs
@@ -50,7 +50,7 @@ public sealed class BattleSession
             [NetworkBattleUri.TurnStart] = new TurnStartHandler(),
             [NetworkBattleUri.Judge] = new JudgeHandler(),
             [NetworkBattleUri.PlayActions] = new PlayActionsHandler(),
-            [NetworkBattleUri.Echo] = forwardWhenReady,
+            [NetworkBattleUri.Echo] = new EchoHandler(),
             [NetworkBattleUri.TurnEndActions] = forwardWhenReady,
             [NetworkBattleUri.JudgeResult] = forwardWhenReady,
         };
diff --git a/SVSim.BattleNode/Sessions/Dispatch/Handlers/EchoHandler.cs b/SVSim.BattleNode/Sessions/Dispatch/Handlers/EchoHandler.cs
new file mode 100644
index 0000000..27dfbb5
--- /dev/null
+++ b/SVSim.BattleNode/Sessions/Dispatch/Handlers/EchoHandler.cs
@@ -0,0 +1,8 @@
+namespace SVSim.BattleNode.Sessions.Dispatch.Handlers;
+
+/// <summary>Echo is the receiver's per-frame ack; the client has no inbound Echo handler, so the
+/// node consumes it (bullet-2 audit). Relaying would risk an echo->echo storm.</summary>
+internal sealed class EchoHandler : IFrameHandler
+{
+    public IReadOnlyList<DispatchRoute> Handle(FrameDispatchContext ctx) => Array.Empty<DispatchRoute>();
+}
diff --git a/SVSim.UnitTests/BattleNode/Sessions/BattleSessionDispatchTests.cs b/SVSim.UnitTests/BattleNode/Sessions/BattleSessionDispatchTests.cs
index 537eb82..03e07a2 100644
--- a/SVSim.UnitTests/BattleNode/Sessions/BattleSessionDispatchTests.cs
+++ b/SVSim.UnitTests/BattleNode/Sessions/BattleSessionDispatchTests.cs
@@ -478,7 +478,7 @@ public class BattleSessionDispatchTests
     }
 
     [Test]
-    public void Pvp_Echo_from_A_in_BothAfterReady_forwards_to_B()
+    public void Pvp_Echo_from_A_in_BothAfterReady_is_consumed_not_relayed()
     {
         var (s, a, b) = NewPvpSession();
         DriveToAfterReady(s, a);
@@ -486,8 +486,7 @@ public class BattleSessionDispatchTests
 
         var routes = s.ComputeFrames(a, NewEnvelope(NetworkBattleUri.Echo));
 
-        Assert.That(routes.Count, Is.EqualTo(1));
-        Assert.That(routes[0].Target, Is.SameAs(b));
+        Assert.That(routes, Is.Empty, "Echo has no inbound handler on the client; relaying risks an echo storm.");
     }
 
     [Test]