diff --git a/implementations/main.cpp b/implementations/main.cpp
index 4671f44..e82bdf6 100644
--- a/implementations/main.cpp
+++ b/implementations/main.cpp
@@ -1106,9 +1106,15 @@ int Probe() {
         en::TouchTracker tracker;
         en::AuthTally tally;
 
+        // The reference frame loop is {QUERY, CAPTURE, REPORT, QUERY, REPORT}.
+        // QUERY_EVENT_STATUS returns its answer in rc -- 5 while an event is
+        // pending, 0 once REPORT_EVENT has consumed it -- and the trailing
+        // query is not decoration: without it the trustlet's event state is
+        // never acknowledged, and after the first verdict every later frame
+        // answers "not identified yet" forever.
         for (int i = 0; i < g_frames; i++) {
             std::vector<std::byte> q(0x10, std::byte{0});
-            SendCommand(app, ta::Cmd::QueryEventStatus, q);
+            auto q0 = SendCommand(app, ta::Cmd::QueryEventStatus, q);
 
             std::vector<std::byte> cap(ta::CaptureDeclaredLen);
             ta::BuildCapturePayload(cap);
@@ -1148,8 +1154,12 @@ int Probe() {
                     return std::string("?");
                 }());
             }
-            std::println("  frame {:2}/{}: metric={:<4}{}{}", i + 1, g_frames, c.metric,
-                         finger ? "  FINGER" : "        ", verdicts);
+            // Acknowledge the event state before the next frame.
+            auto q1 = SendCommand(app, ta::Cmd::QueryEventStatus, q);
+
+            std::println("  frame {:2}/{}: metric={:<4}{} evst {}->{}{}", i + 1, g_frames,
+                         c.metric, finger ? "  FINGER" : "        ",
+                         q0.invoked ? q0.rc : -999, q1.invoked ? q1.rc : -999, verdicts);
             std::this_thread::sleep_for(std::chrono::milliseconds(g_frameGapMs));
         }
         // Only a terminal verdict is an attempt. Counting rescan frames as