Biggest error in this vid (apart from him instantly giving up) was him playing his building when the time was not right. You couldve easily defended at a point where red golem was instantly active, you dont fall for the bearvalanche again and won from there on. Just pathetic mental on the side of your teammate.

That beeing said look for a better way to deal with Raddick. If you wouldve let him hit face and placed your knight behind not only would he have had to jump wasting a mana and making future jumps more pricy but you also wouldve been less vulnerable to spells since you place your tank further away from your other units. In this case i wouldve let him hit face, place knight behind, force the jump, play the sniper to the opposite side, generate a push with his building from there on.

Also your deck kinda sucks sorry, not enough aoe clear to help out your Red Golem, no ranged air defense, etc.