One of the defendants attacked the other before being restrained.
Ricardo Cruz and Alfredo Acquino were both convicted in the 2014 shooting of Ximena Meza.
Prosecutors say they were trying to shoot members of a rival gang at the time.
Both were found guilty of one felony count each of second degree murder, street terrorism, possession of a firearm by a felon, and possession of a firearm within 1,000 feet of school grounds with sentencing enhancements and allegations for criminal street gang activity and a gang member vicarious discharge of a firearm causing death. It is also alleged that Cruz and Aquino were both previously convicted of a serious felony in July 2014 for one felony count each of possession of a prohibited weapon and street terrorism.
Both men are facing 40 years to life in prison when they're sentenced in August.