He came on and put himself about more than the rest of the team did in previous 68 mins (not including Ndiaye in that), got on the ball instantly and continuously for the next 25 mins, tried linking up with others who quite frankly weren't on his wavelength (Max Lowe in particular), made runs, showed for the ball, didn't hide (fleck). The guy is direct, pacey and lively and you may or may not have noticed Watford made sure when Khadra was on the ball they had at least 2 men around him - for other teams this would free up space in other areas of the pitch sadly for us we take that long to move the ball all the space disappears. A headless chicken as you described him as would be better used to describe Max Lowe who doesn't seem to have co-ordination between his brain and the movement of his legs (unless he's playing at the city ground apparently)