diff --git a/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt b/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
index 7c44163..90358bd 100644
--- a/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
+++ b/app/src/main/java/com/k2fsa/sherpa/onnx/MainActivity.kt
@@ -1822,14 +1822,53 @@ class MainActivity : AppCompatActivity() {
         val pre = SpeakerRecognition.registry.search(acc, speakerThreshold)
             ?: nearestAttribution(acc, SpeakerRecognition.registry, verdictFallbackMin)
         when {
-            pre != null && pre == active ->
-                Log.i(TAG, tag + "-CANCEL-LATE known=$pre(active) revert-via-verdict")
+            pre != null && pre == active -> {
+                Log.i(TAG, tag + "-CANCEL-LATE known=$pre(active) active-heal")
+                // 主动善后:不再被动等句子结束(长句让错标挂几十秒),立即撤销
+                uiHandler.post { revertOnsetSwitch(label, pre) }
+            }
             pre != null ->
                 Log.i(TAG, tag + "-RECHECK known=$pre label=$label (verdict migrates)")
             else -> SpeakerRecognition.registry.addAuto(label, acc)
         }
     }
 
+    /** 乐观切换的主动善后(2026-09-16"善后不理想"整改):准确复核认出同一
+     *  人时立即撤销,不等句子结束——覆盖预置标签、还原钉住的标签、占位行
+     *  就地改签并与上方同人并回、清理快镜像占位编号。主线程执行。 */
+    private fun revertOnsetSwitch(firedLabel: String, prevActive: String?) {
+        if (prevActive == null) return   // 无旧主可还原(会话极早期)→ 被动链
+        val bottom = subtitleLines.lastOrNull()
+        val pending = pendingOnsetLabel
+        val inFlight = pending == firedLabel ||
+                (bottom != null && bottom.label == firedLabel && bottom.open)
+        if (!inFlight) return            // 状态已走远(连环切换等)→ 交给被动链
+        if (pending == firedLabel && bottom != null &&
+            bottom.label != firedLabel
+        ) {
+            // 占位行尚未建立(补喂机制下多数如此):抹掉切换痕迹——预置标签
+            // 作废、重开旧底行,同人续说零断行,观感上从未切过
+            pendingOnsetLabel = null
+            onsetClosePending = false    // 防在途定格回来补封行
+            if (!bottom.open) bottom.open = true
+            lastConfirmedLabel = prevActive
+            SpeakerRecognition.fastRegistry.removeAuto(firedLabel)
+            Log.i(TAG, "SWITCH-REVERT(pre-line) $firedLabel -> $prevActive")
+            return
+        }
+        // 占位行已建立:就地改签 + 与上方同人并回
+        pendingOnsetLabel = null
+        lastConfirmedLabel = prevActive
+        if (bottom != null && bottom.label == firedLabel) {
+            bottom.label = prevActive
+            bottom.colorIdx = colorIdxFor(prevActive)
+            val merged = mergeLineIntoPrevIfSame(bottom, prevActive)
+            if (!merged) notifyLine(bottom)
+        }
+        SpeakerRecognition.fastRegistry.removeAuto(firedLabel)
+        Log.i(TAG, "SWITCH-REVERT(line) $firedLabel -> $prevActive (active-heal)")
+    }
+
     private fun appendNewLine(label: String?): SubtitleLine {
         // 新行出现即封掉之前的开放行,并把其中"未定格的进行中句子"整体迁移
         // 过来 —— 硬保证 in-progress 只可能发生在最底行(修复:声纹判定搬家后,
diff --git a/app/src/main/java/com/k2fsa/sherpa/onnx/SpeakerEmbedding.kt b/app/src/main/java/com/k2fsa/sherpa/onnx/SpeakerEmbedding.kt
index af3a1fa..270c2cf 100644
--- a/app/src/main/java/com/k2fsa/sherpa/onnx/SpeakerEmbedding.kt
+++ b/app/src/main/java/com/k2fsa/sherpa/onnx/SpeakerEmbedding.kt
@@ -99,6 +99,12 @@ class SpeakerRegistry {
         auto.add(Pair(name, l2normalize(e)))
     }
 
+    /** 撤销乐观切换时移除占位编号(2026-09-16:防被清掉的号继续被检索命中)。 */
+    @Synchronized
+    fun removeAuto(name: String) {
+        auto.removeAll { it.first == name }
+    }
+
     // Enroll (or overwrite) a real name for a given embedding.
     @Synchronized
     fun addNamed(name: String, e: FloatArray) {