Don't cross within 7 feet (4 amot, or 2.1 m) in front of someone who is saying the amida, even if there is an intervening chair or other furniture in front of the person who is praying. If you finish before someone who is directly behind you, you must wait for the person to finish his or her amida before you step directly back. However, you may step back on an angle so that you do not end up in front of the person who was behind you.