He would get knocked down frequently because of his balance. The way he stands is awkward, and he bends at the waist with his legs wide apart. His balance was always his weekpoint of his footwork; however, without being able to use his footwork, his head movement becomes non-existent, and he can't get off his jab to keep guys busy, and simplest of all he can't move to avoid punches. Simply put, without his legs Martinez can't do anything. He uses his legs to move off from and around his jab, which essentially is his biggest defense. He uses his legs more than his head to defend punches, and he bends at the waist in his awkward stance again, bending his knees and using his legs, this allows him to stay away from body shots (by having his waist behind his head essentially), and keep his hands down style by avoid punches using his legs and head and his jab as a measuring pole for distance. He did absolutely none of this against Cotto from the jump. That's how we know it wasn't a healthy Martinez in the ring.