Final answer:
The passer continues to be a defenseless player until the legal forward pass ends or the passer moves to participate in the play.
Step-by-step explanation:
The statement is true.
When a legal forward pass is made, the passer becomes a defenseless player until the pass ends or the passer becomes involved in the play by moving towards the line of scrimmage.
During this time, the passer is protected by specific rules that prohibit defenders from hitting or tackling them. This is to ensure the safety of the passer and promote fair play.