Colin had a brain tumour back in 2015 – it was a benign meningioma. Doctors determined that the tumour was still growing, so they had to remove it. (The surgeon told Colin he would probably have only had a year to live before it killed him). After surgery Colin’s scar became infected, resulting in sepsis; it was one of the scariest times of his life. Because Colin developed sepsis, they don’t want to re-operate on his head to replace the missing plate with a new one. This is why he has a dip in the back of his head, which makes him feel slightly vulnerable.