▁of ▁his ▁career , ▁M out sing a ▁spent ▁the ▁ 2 0 0 5 / 0 6 ▁season ▁with ▁the ▁Racing ▁Club ▁Str as bourg ▁in ▁France ▁( 2 nd ▁Am ateur ▁League ) ▁before ▁returning ▁to ▁Berlin ▁again . ▁ ▁He ▁was ▁part ▁of ▁the ▁German ▁Se vens ▁side ▁at ▁the ▁World ▁Games ▁ 2 0 0 5 ▁in ▁D uis burg , ▁where ▁Germany ▁finished ▁ 8 th ▁and ▁played ▁two ▁tournament s ▁of ▁the ▁IR B ▁Se vens ▁Series ▁in ▁ 2 0 0 6 ▁in ▁Paris ▁( France ) ▁and ▁London ▁ ▁( Eng land ). ▁During ▁that ▁two ▁tournament s ▁M out sing a ▁scored ▁three ▁tries , ▁one ▁of ▁it ▁in ▁T wick en ham ▁Stadium . ▁In ▁his ▁young ▁age ▁of ▁ 2 3 ▁years , ▁the ▁sc rum - half ▁spent ▁three ▁final ▁European ▁Championships ▁Tourn aments ▁in ▁Mosk au / Russ ia ▁( 2 0 0 5 ▁and ▁ 2 0 0 7 ) ▁and ▁in ▁Hannover ▁( 2 0 0 8 ) ▁with ▁the ▁Se vens ▁Team ▁of ▁Germany . ▁He ▁was ▁also ▁again ▁part ▁of ▁the ▁team ▁at ▁the ▁ 2 0 0 9 ▁Hannover ▁Se vens , ▁the ▁final - round ▁of ▁the ▁European ▁Se vens ▁Championship ▁ 2 0 0 9 . ▁ ▁He ▁was ▁part ▁of ▁the ▁German ▁team ▁at ▁the ▁ 2 0 0 9 ▁London ▁Se vens . ▁ ▁M out sing a ' s ▁last ▁game ▁for ▁the ▁German ▁XV ▁was ▁a ▁friendly ▁against ▁Switzerland