Final answer:
If R1 signals for a fair catch during a kick, he is prohibited from tackling until the kick ends.
Step-by-step explanation:
If R1 signals for a fair catch during a kick, he is prohibited from tackling until the kick ends. A fair catch is a signal made by the receiving team to catch the ball without being tackled immediately. By signaling for a fair catch, R1 is essentially asking the kicking team to give him a free catch without any interference.