obscuring effect and controlling sketchHELP!

reel

Member
Hi guys i was just wondering how can i obscure an effect ( not neccessary asking for shortcuts) for example a light trail that goes around the person , dispappearing when its behind him and then re appearing when it passed him, this im asking regarding mainly a round, circle motion path...is there any easy way without having to mask the to-be-obscure portion?
For my second question, i wanna know if anybody can help me draw a smooth round motion path/sketch, i used the smoother but that only help me so much??
Thanks!!! in advance....
 
Never mind abt the motion sketch .. i got that ( forgot I could use the mask and paste it to the position of another layer :P )
 
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