大聯盟的規則 - 合法接殺
Rule 6.05(a) Comment: A fielder may reach into, but not step into, a dugout to make a catch, and if he holds the ball, the catch shall be allowed. A fielder, in order to make a catch on a foul ball nearing a dugout or other out-of-play area (such as the stands), must have one or both feet on or over the playing surface (including the lip of the dugout) and neither foot on the ground inside the dugout or in any other out-of-play area. Ball is in play, unless the fielder, after making a legal catch, falls into a dugout or other out-of-play area, in which case the ball is dead. Status of runners shall be as described in Rule 7.04(c) Comment.

至少一隻腳要在場內或場內上空，且不能踩進休息區或任何場外區域。
除非接球後跌入休息區或其他場外地區，不然都算活球。



5.10(f)
When a fielder, after catching a fly ball, falls into a bench or stand, or falls across ropes into a crowd when spectators are on the field. As pertains to runners, the provisions of 7.04(c) shall prevail. If a fielder after making a catch steps into a bench, but does not fall, the ball is in play and runners may advance at their own peril.

如果接到球以後，不是跌到場外，而是走進板凳區，此時還是活球。跑者可以自行選擇要不要進壘。



Rule 7.04(c) Comment: If a fielder, after having made a legal catch, should fall into a stand or among spectators or into the dugout or any other out-of-play area while in possession of the ball after making a legal catch, or fall while in the dugout after making a legal catch, the ball is dead and each runner shall advance one base, without liability to be put out, from his last legally touched base at the time the fielder fell into, or in, such out-of-play area.

所以對於跑者而言，當接殺後防守球員跌出場外，此時是死球，打者出局，但跑者前進一個壘包。



總結:
1.在合法接殺下，跌入全壘打牆外，打者是出局的。只要有一隻腳是踩在全壘打牆外的區域，就變成全壘打。
2.跌出去之後，變成死球，打者出局，但壘上跑者免費前進一個壘包。
3.如果接到之後，是走到場外區，則此時還是活球，跑者可以自行決定要跑或不跑。(這應該是指像忘了出局數，接殺後自己走回休息室之類的。)

以上有錯請更正，謝謝 ~