Issue with T-Bell Guards

[Sharpy]

Okay so there's an issue where you have to distract the guards and like you control the fart to distract them.. Well whenever I do this the one on the left doesn't do anything, he just stands there.   Does anyone know what is going on? I could use some help I feel like I'm pretty far into it at this point.

[Bazgrim]

When you use your sneaky squeaker make sure both guards are highlighted before you click.

They glow a faint green if it's going to affect them.