If you focus on the positioning and color of the weapon as apposed to the implied bias on the participants part its clear to me the bias lies in the color and pose of the weapon vs the the contrasting elements that make up the test (i.e. the black weapons vs metallic and the pose and coloring of the participant and clothing) its all about contrast vs visual acuity, not about racism.

Game Over
Your Score: 700
Average reaction time:
Black Armed:655.04ms
Black Unarmed:755ms
White Armed:653.92ms
White Unarmed:719.8ms