that is more than off road rather seems like you brother had went on dirt racing 
keep eye on your brother it seems he is using your bike for dirt racing
without telling you 
did not you take picture of your brother when he returned i wanna
see his condition too after this off road ride
GD110 fenders seems useless bike gets very dirty even if driven
at slow speeds on mud front mud gaurd is not full & rear tire is naked
too its just rather small tail in the end of GD110 not a proper fender