When you do move your character by clicking on a location with the mouse and holding the mouse button, normally the character is following the mouse pointer even while moving the mouse as long as you hold the button.
But this does not work when you start this with a click+holding while the cursor is over the spidernet that is spawned by wickerbottoms new book "Overcoming Arachnophobia".
spawn the spidernet with wickerbottoms book "Overcoming Arachnophobia". Click and hold the left mouse button while the cursor is over the net. hold the button and move the mouse to see that wickerbottom is not following the cursor.