diff --git a/spikes/README.md b/spikes/README.md
index 2874d0b..ea796bb 100644
--- a/spikes/README.md
+++ b/spikes/README.md
@@ -123,7 +123,12 @@ CLSID in it, so `CoCreateInstance` has nothing to name. The only registered cocl
 IDLs belong to the compat surface (`WSLCCompatSessionManager` and its factory) and to the WSL
 service proper (`LxssUserSession`, `LxssUserSessionInBox`).
 
-The likely answer is that one of those objects also implements the internal interface — COM
+**Answered on hardware (WSL 2.9.4): yes.** `WSLCCompatSessionManager`
+(`a9b7a1b9-0671-405c-95f1-e0612cb4ce8f`) — the same class the SDK itself activates — answers a QI
+for `IWSLCSessionManager`. One object, two faces. `IWSLCVirtualMachine` was refused by every
+class, confirming §13.1's retraction against the machine rather than against an IDL.
+
+The hypothesis was that one of those objects also implements the internal interface — COM
 objects routinely expose several — so `--internal` activates each and QIs for the internal IIDs.
 It **never calls a method**, so a vtable mismatch cannot crash it, and QI alone answers the
 question. `--internal-call` then calls `GetVersion` (slot 3) and `ListSessions` to confirm the
diff --git a/spikes/WslcApiDump/InternalComProbe.cs b/spikes/WslcApiDump/InternalComProbe.cs
index 4ce480b..a8d9738 100644
--- a/spikes/WslcApiDump/InternalComProbe.cs
+++ b/spikes/WslcApiDump/InternalComProbe.cs
@@ -52,7 +52,10 @@ internal static class InternalComProbe
         ("IWSLCSessionManager", new Guid("82A7ABC8-6B50-43FC-AB96-15FBBE7E8760"),
             "THE one that matters — OpenSessionByName/EnterSession/ListSessions, i.e. reattach"),
         ("IWSLCSession", new Guid("EF0661E4-6364-40EA-B433-E2FDF11F3519"),
-            "ListContainers/OpenContainer — enumeration and the container half of reattach"),
+            "ListContainers/OpenContainer. EXPECTED to fail here, and its failure is not a gap: a "
+            + "session is RETURNED BY the manager (OpenSessionByName/EnterSession/CreateSession), "
+            + "not QI'd off it. Probed only to confirm the manager is a manager and not a "
+            + "do-everything object"),
         ("IWSLCVirtualMachine", new Guid("B5E2D8F1-9A3C-4E6B-8D1F-7C4A2E9B6D3A"),
             "GetId → the VM GUID an AF_HYPERV bind needs. Per the IDL only a factory the SYSTEM "
             + "service owns can produce one, so this is EXPECTED to fail — probed anyway, "