Shocking murder in German courtroom racially motivated?

This murder case is as shocking as it is remarkable for where it occurred - in a courtroom during another less serious dispute. The Islamic couple were bringing a defamation charge against a Russian-born german man in Dresden GER over a school-yard altercation when the wife was fatally stabbed before her husband knew what was happening. He was also injured in the attack as he tried to come to his wife's defense.