EVENT_MENUCURSORLEFT is a menu event.
This event is called when the left-hand menu cursor is being drawn.
The RETURN variable will be set to the current tile index of the spinning nuke icon (tile indices 2813-2819). Note that for the left cursor, it starts at 2813 and advances forward by one tile, looping after 2819.
Modify this value to change the tile that is being displayed for the left cursor during that frame.