Uhhh, there's not supposed to be any success-sound?...that is strange.
The "bzzz" sound is to indicate a "blocked" QTE, as you can only hit the right arrow key once per half cycle (the locked state is indicated by the translucency of the QTE bar). This is to prevent the player from simply spamming the right arrow key, and to synchronous with the player's slow stride. The pain/break sound is a failed attempt.
The locking of the mouse is an expected behavior, it's to capture the keyboard input with the UI buttons. (except the main menu)