※ 引述《aroyneil8256 (方向 )》之铭言：
: 在任一方发边线、发底线球，
: 裁判应“主动”要求防守者，
: 退离执行发球者“2步以上”；
: 假如裁判没有提出要求，
: 执行发球的球员可以要求裁判协助驱离防守者保持距离。
不懂规则在那边乱唬烂
先别说这是NBA，连FIBA都没有2步以上这种规则，
https://www.fiba.com/downloads/Rules/2014/Official_Basketball_Rules_2014_Y.pdf
17.3.2
During the throw-in other player(s) shall not:
。 Have any part of their bodies over the boundary line
before the ball has been thrown-in across the boundary line.
。 Be closer than 1 m to the player taking the throw-in when the throw-in
place has less than 2 m distance between the boundary line and
any out-of-bounds obstructions.
也就是身体不要越线，
如果发球位置距离边线只有不到2公尺的距离，其他人要跟发球者保持超过1公尺的距离
换句话说，如果发球位置距离边线有超过2公尺的空间，其他人就是保持不要越线就好
没有什么2步这种规则，又不是系队
再来是NBA的规定
http://www.nba.com/media/dleague/1314-nba-rule-book.pdf
Rule 8. Section III
Until the passed ball has crossed the plane of the boundary,
no player shall have any part of his person over the boundary line
and teammates shall not occupy positions parallel or adjacent
to the baseline if an opponent desires one of those positions.
也只是提到不要越线
Rule 10. Section III
A thrower-in shall not
(1) carry the ball onto the court;
(2) fail to release the ball within 5 seconds;
(3) touch it on the court before it has touched another player;
(4) leave the desig- nated throw-in spot;
(5) throw the ball so that it enters the basket
before touching anyone on the court;
(6) step on the court over the boundary line before the ball is released;
(7) cause the ball to go out-of-bounds without being touched
by a player in the game;
(8) leave the playing surface to gain an advantage on a throw-in;
(9) hand the ball to a player on the court.
一样就是不要越线，
简单说，发球完成前：
双方不要踩线跟越线；
发球者不要接触到场内跟其他场内球员；
其他球员不要接触到发球员。
马妞踩线 ＝》违例
发球干马妞拐 ＝》违例
裁判没看到 ＝》 正常的，没事，没事。