Great question — answering as the UphillTech team:
The directness of a free kick relates to the severity of the infringement - direct free kicks are awarded for more severe issues and may score a goal without touching any other player, while indirect free kicks are for less severe issues and must touch another player before counting as a goal. It's fairly reasonable that the team being awarded the free kick would never have the extra burden of the free kick being considered direct against their own goal - the kick being direct serves to punish the defending team, and shouldn't put the offense at any risk at all. An indirect free kick certainly wouldn't count if kicked directly into either goal, and it would be odd if the offense was put at...
Full answer by Nuclear Hoagie: https://sports.stackexchange.com/a/30390 (CC BY-SA 4.0).
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