in florida an incredible movement was born called never again. co-founder, 16-year-old alfonso calderone believes the energy that we're experiencing here and the message of this march is destined to intensify. >> we first saw your pain, we saw your passion when after that shooting in parkland you took on lawmakers, legislators in tallahassee, florida. >> people are losing their lives, and it is still not being taken seriously. i was in a closet locked for four hours with people who i would consider almost family crying and weeping on me, begging for their lives. >> it seems as though you've gotten louder, you've become more determined after that. how has your focus changed? >> i feel like our focus has expanded. i don't feel like it's necessarily changed. the mission and the goal is still the same. we want comprehensive and common