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The Raiders defeated the 49ers on Sunday for Bay Area bragging rights, and Sio Moore immediately took advantage with a social media post that called out Colin Kaepernick.
"There's a difference between boys and Men... Freakin chump," Moore wrote with a photo of he and Kaepernick jawing at each other.
[RELATED: Moore calls Kaepernick 'freakin' chump']
The origin of their bad blood is coming into focus. As both teams walked off the field for halftime -- tied 10-10 -- Kaepernick and Moore were seen engaging in a heated argument.
In a video of the argument, obtained by TMZ, Kaepernick is heard telling Moore, "I'm coming for you."
Moore responded with obscenities as the two made their way into the tunnel. At the Oakland Coliseum, both teams leave the field using the same exit, after which they split to their respective locker rooms.
The 49ers failed to score a touchdown in the second half and were outscored 14-3, suffering a 24-13 loss.