As a Muslim I completely condemn this act. As long as the guy is not attacking (verbally or psychologically) the Muslim community , no body has a right to lay a single finger on this "Mohamed" guy. There is no Sharia system in Ethiopia to judge some one for "Redd"
My friend, don't put any precondition to respond physically. It is neither legal nor spiritual to rspond physically unless it is for self-defence. Otherwise learn to forgive or use legal means in the worst case. You defend urself and let God defend ur faith/religion. if somebody says bad things about ur religion plz don't respond physically whatsoever. Just leave him and let God judge him. this is what I think the muslims lacks.