When Angelina Lazo learned the identity of the student who killed 17 people at her Parkdale, Florida high school on Wednesday, she wasn’t surprised.“He was really quiet,” said Lazo, 18, who took a biology class with Nikolas de Jesus Cruz in her sophomore year. “Most of the class didn’t engage with him.”The former student admitted to authorities that he entered the Marjory Stoneman Douglas High School campus, pulled the fire alarm to gather students in the hallway, and started shooting with an AR-15 assault rifle. Police say he slipped out of the building with other fleeing students, stopped at a McDonalds, and was arrested later that day. He has been charged with 17 counts of premeditated murder.Other students and faculty members have said they were concerned about Cruz, who had posted images of weapons on Instagram and had previously written a YouTube comment about a desire to become “a professional school shooter.’“I just feel like everyone says, ‘If you see something, say something,’” Lazo told VICE News. “We saw him. We heard the things he would say.”VICE News spoke to her about what happened that day, and what she knew about the alleged shooter.