A 22-year-old Boston Celtics fan claims he was stabbed by a man wearing a Miami Heat jersey outside the Boston Garden following Game 6. He received ten stitches.

That’s when a group of men in Heat T-shirts started yelling at him. “They were saying, ‘Go Heat, blank the Celtics.’”

When the Celts fan yelled back, he says one of the Heat fans charged him and then stabbed him in the back of his leg. “That’s just the worst kind of passion I’ve ever seen, and to be carrying a kitchen knife with you. You’re clearly looking to maim, possibly kill somebody,” he says.

The man was described as “short” and “Hispanic.”