By AMANDA KRALEY, 17, and KELSEY McCAFFREY, 16 MARIA CARRILLO HIGH SCHOOL ‘‘I remember it happening, but after that, nothing. It’s like it never existed,” Maria Carrillo High junior Alex Wrenn said of the concussion he suffered last August. Wrenn, a nose tackle for Maria Carrillo’s varsity football team, was hit in the chin with the top of a football helmet during practice. “I know what happened, I remember getting hit,” he said. “But remembering it, I feel like it… Read More »