The Green Arrow bleeds Orange.

"Arrow" star Stephen Amell nearly bled red, however, when a fan allegedly head-butted him after attending the Syracuse football game on Saturday. It was the 35-year-old Canadian actor's 13th year in a row coming to Syracuse University to cheer on his favorite college sports team with friends, but SU's loss to North Carolina State wasn't the only disappointing part of the trip.

"Dude came up to me yesterday... Head Butts me hard. Outta nowhere," Amell wrote on Instagram Sunday. "Then [he] says 'I want to fight the Green Arrow.' Paused, looked at him... shook his hand and said no thank you. Because I'm a father and a husband. Pretty manly if you ask me."

Attached was a photo of Amell's face, showing his nose and right eye slightly bruised from the incident. He did not specify if the attack happened on the Syracuse campus.

Amell, best known for playing DC Comics superhero Oliver Queen on The CW's "Arrow" and Casey Jones in "Teenage Mutant Ninja Turtles: Out of the Shadows," has been a longtime SU fan, cheering on the football and basketball teams for more than a decade. According to his social media posts, he visits the Carrier Dome once a year with friends from his hometown of Toronto.

The actor did not attend Syracuse University and has not specified why he loves the Orange, but his first time attending an SU game was in 2003, the year Jim Boeheim and Carmelo Anthony led the basketball team to an NCAA Championship title. Amell did not say if Saturday's incident would deter him from returning.

"Arrow" airs Wednesdays at 8 p.m. on The CW. Amell has also appeared on "The Flash" and will team up with "Supergirl" and "DC's Legends of Tomorrow" for a crossover episode next month.