There are plenty of people on the field as a Hesperia High football player lies face down after a collision against Serrano High in Phelan last Friday. Some schools don't have doctors at games.; PHOTOGRAPHER: GEORGE WILHELM / Los Angeles Times; Crenshaw quarterback Eric Willcockson is treated by paramedics on the bench after suffering a concussion against Dorsey on Oct. 12.; PHOTOGRAPHER: LORI SHEPLER / Los Angeles Times; Dorsey's Jamaal Moore is helped off the field by trainers and coaches after suffering a hard hit against Crenshaw on Oct. 12.; PHOTOGRAPHER: LORI SHEPLER / Los Angeles Times; The marquee at Costa Mesa High pays tribute to [Matt Colby], left, who died after being injured in a game Sept. 28.; PHOTOGRAPHER: KEVIN P. CASEY / Los Angeles Times; no caption; A Hesperia High player, injured during a game against Serrano on Oct. 19, has his head strapped down as he is taken off the field.; PHOTOGRAPHER: GEORGE WILHELM / Los Angeles Times; Darren Wedertz was partially paralyzed after injury in a 1992 game. 'Like he had a lobotomy,' says his mother, Charlene.; PHOTOGRAPHER: AL SCHABEN / Los Angeles Times; Julia, left, and Tasha Hoggatt hold a photo of their brother, Eric, who died after suffering a head injury for Reseda High in 1996.; PHOTOGRAPHER: RICHARD HARTOG / Los Angeles Times