Watch: Spartak Moscow Fans Hurl Flare at Referee

That's aggressive.

Spartak Moscow traveled to Slovenia to play Maribor in a Champions League group stage match on Wednesday. 

Spartak came away with a 1-1 draw, which isn't a horrible result on the road. But their fans weren't at all happy with the way the game played out. That is, if throwing a freaking flare halfway across the field at the referee is any indication of their feelings. 

That video is truly horrifying—a solid portion of the stands are completely covered by fire and smoke. And there was nothing stopping those fans from firing flares at players or opposing stands. 

I'm not sure what the existing safety procedures are like at Slovenian soccer stadiums, but whatever they are, let's go ahead and beef them up.