《三十六计·混战计·关门捉贼》
对于弱小的敌人，要加以包围，歼灭；对付垂死挣扎的敌人，如果让他逃脱之后又穷追远赶，那是很不利的。
小敌困之。剥，不利有攸往。
Encircle and annihilate weak enemies; it’s unwise to let those who are struggling at their last gasp go and chase after them later on.