diff --git a/docs/index.md b/docs/index.md
index 3698e6e..d2ccb02 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -119,7 +119,7 @@ step behind a slow link.
-*70 seconds, no sound: one value changed on its way to the trainer, a learning
+*67 seconds, no sound: one value changed on its way to the trainer, a learning
curve that rises anyway, and the step ledger that finds the change.*
The same bridge let us ask how a broken boundary shows itself. While SB3's
diff --git a/docs/index.zh.md b/docs/index.zh.md
index 4259564..9dd4058 100644
--- a/docs/index.zh.md
+++ b/docs/index.zh.md
@@ -94,7 +94,7 @@ RLinf 还训练了跑在一台笔记本上的 16 个 HalfCheetah 环境端，那
-*70 秒，无声：一个值在送往训练端的路上被改掉，学习曲线照样上升，步账本找到了这处改动。*
+*67 秒，无声：一个值在送往训练端的路上被改掉，学习曲线照样上升，步账本找到了这处改动。*
借同一个 bridge，我们还能看边界出错时会有什么表现。Stable-Baselines3 的 PPO 训练
Pendulum、HalfCheetah、Hopper 和 7 关节机械臂 Pusher 时，环境端把发出去的某一个字段按
diff --git a/docs/media/boundary-faults.mp4 b/docs/media/boundary-faults.mp4
index 00e9c78..b73de00 100644
Binary files a/docs/media/boundary-faults.mp4 and b/docs/media/boundary-faults.mp4 differ