to see red mist- a condition certain people get into- usually caused by mental conditions but can be brought on by extreme stress/anger- when one is extremely angry there is stress put on facial muscles. the mark for one losing control of themselves and raging, destroying things/people in their vicinity, is when internal blood vessels in or near the eyes start leaking. the blood can sometimes spill into the inside of the eye, causing the person to see everything through a "red mist", hence the name. at this point, however, the person is so angry that they completely lose control and essentially go insane for a time. the condition naturally causes the person's eyes to turn red, which makes the experience for a bystander go from quite frightening to positively terrifying.
Chris was so enraged at the abuse of his lover that he saw red mist.