I have added a video to this page under item 19.
Touching Loose Impediments or Ground in a Penalty Area.
It better illustrates Rule 17.1b, ‘play the ball as it lies, without penalty, under the same rules that apply to a ball in the General Area, i.e. there are no specific Rules limiting how a ball may be played from a penalty area.
To view the video click on Touching Loose Impediments or Ground in a Penalty Area