There is, in fact, a halal form of soccer--the dimensions of the field are slightly different and each & every rule is also slightly different so the imans can say it is purely Islamic and not related to anything western. The kidnapped dude played western-rules soccer and is therefore 'fair game'.
The soccer field must not be marked with boundary lines because this is what the infidels do. The FIFA’s internationally recognized rules of the game should not be observed. The customary soccer terms such as foul, corner kick, penalty kick, out, and goal, must be forbidden from use. A player that uses them must be expelled from the playground after telling him, “You have emulated the infidels and the polytheist.”
The game cannot be interrupted if a player was injured while playing, even if it is a fracture in the arm or the leg. Showing a yellow or a red card to an offender must not be allowed because the Islamic Sharia should be the basis to settle all disputes in accordance to the dictates of the Quran and after hearing testimonies of those who witnessed the incident.
Among the provisions of the strange fatwa, the team should be less or more than the normal 11 players, to avoid conformity with the infidels.
The players must wear the Islamic traditional garb not the shorts and T-Shirts that have numbers because this is not the way Muslims dress.
The fatwa demands that the game is played in one single session, or three thirds, instead of the customary first and second half. There should be no over time, or penalty kicks to decide the winner, as the infidels do.
The fatwa doesn’t allow game referees, because to utilize them implies compliance with international laws. In addition, there should be no spectators because the purpose from the game is to exercise, this is why everybody should participate in playing rather than just sitting on the sidelines.
The goal’s perimeters should be only two vertical posts. There should be no horizontal post in order to not conform to the infidels. If any player celebrates after scoring a goal, he should be rebuked and punished by spitting in his face because there should be no correlation between joy, hugging, and sports.
The fatwa forbids having alternate players, the reason, of course, is to not imitate the infidels.
http://www.islamreview.com/articles/islamicfatwa.shtml