Tensions run high as Stef and Lena are called to action when the school is put on lockdown after it’s discovered that Mariana’s boyfriend Nick brought his father’s gun on campus, after seeing her kiss her ex-boyfriend Mat. Callie admits her past rela... (more)tionship with Brandon to her moms. But before Stef and Lena can even process the information, the school goes into the “Code Blue” lockdown.