The holder can rise and throw or run the ball:
While the holder’s knee is down in NFHS, he cannot control the snap and then throw a pass. Such action causes the ball to become dead immediately. If the holder rises, he can pass, run or hand off to another player. The ball remains live if the holder rises and catches or recovers an errant snap and immediately returns his knee(s) to the ground and places the ball for a kick or again rises to advance, hand, kick or pass (4-2-2 Exc.).
When thinking of players associated with the kicking game, the usual focus is on those who kick the ball and team R players attempting to catch and return them. However, another participant involved with scrimmage kicks is the holder. The rulebooks define the holder as the player who controls...
www.referee.com