Not much was expected of Harrison when watching Washington State film, but his production in his first year as a starter was a pleasant surprise. He is a very quick-footed runner, but is more quick than fast and lacks the very good explosive burst and playing speed wanted in a smaller back. His playing speed is deceptive -- he lacks elite speed, but does outrun some angles. He is a good receiver out of the backfield, catches the ball away from his body well and can adjust to make tough catches seem routine. For a short and smaller running back, he is stronger than expected -- he can keep his feet vs. hard hits and arm/grab tackles, but he is not a tackle breaker. It's a concern that he was only a one-year starter at Washington State because he has not proven his long-term durability yet. Additionally, it's a concern that he does not get low and run aggressively if there is no hole. Overall, Harrison may not be a good starter in the NFL, but he will be a good third-down back and a very good backup/change-of-pace back.

Harrison is a surprisingly competitive running back who fights and competes very hard for every last yard until he is on the ground. He is an instinctive runner with very good vision and he has the very quick feet to take advantage and get through holes. His surprising strength and balance and agility enable him to consistently run through arm/grab tackles, keep his feet vs. hard hits and gain yards after contact. He is a good receiver out of the backfield and is an elusive and productive runner once he gets the ball in the open field. He does a surprisingly good job of picking up blitzers in pass protection despite his lack of size.

Harrison is a short running back who looks surprisngly small on film and lacks the bulk/strength to be an effective runner between the tackles. While he is a very quick-footed back, he is quicker than fast and lacks the big-time playing speed wanted in a smaller running back. He is not an aggressive runner and will not slam the ball up into the line of scrimmage if there is no hole and will just dance around. He is somewhat of an upright runner and does not lower a shoulder to deliver a blow to the potential tackler, which is why he is not a tackle breaker.

Harrison is a quick footed running back whose athleticism has helped him to overcome his lack of size. His very quick feet combine with his agility and balance to let him change directions quickly -- he can stop and start fast to shake and make tacklers miss consistently. He can make the sharp jump-cut in the hole to burst through the backside hole and can bounce runs outside when the middle is clogged up. He has the flexibility to his lower shoulder when running, but more often than not, he runs upright and takes hard hits. He is a very coordinated athlete, which helps him to make sharp cuts and take hard hits without losing feet. While he is a good athlete, he is quicker than he is fast and lacks the explosiveness and top-end playing speed wanted in a shorter running back.

Harrison has shown toughness taking hard hits and consistently fighting for extra yards until he is on the ground, but he does not run aggressively and does not attack the line of scrimmage if there is no hole. He has shown the ability to make clutch plays when he gets out into the open field, but having started for little more than one season and stuggling on short-yardage runs, he has not proven he could be a consistent clutch producer. He was consistently productive when he got the carries, but his overall production has only been adequate because he was only a full-time starter for one season. He is a very consistent runner who is always quick and elusive and makes things happen when he gets in the open field and struggles when to be the big, strong power runner. He is a very competitive runner who consistently runs hard and keeps legs churning and fights for yards until he ends up on the ground.

Harrison is a smart running back and it shows in the good job he does in pass protection, where he seems to consistently line up correctly and pick up the right blitzer. Additionally, he is a smart runner who really follows his blockers very well. He has very good instincts to find the backside hole consistently and the foot quickness to react and get through the hole fast. He consistently plays with a high level of concentration, which is what enables him to keep his feet vs. hard hits, to run through arm/grab tackles and gain yards after contact.

Harrison has decent weight for his height, but he is shorter than ideal and looks smaller than his measured size on film. While he is a tough kid and was durable in 2005, he was only a full-time starter one year in college and looks tiny on film, so there is concern about his ability to be a durable NFL runnng back. While Harrison is not a truly explosive player, he does have a quick and explosive burst through the hole to get behind the defense. He lacks the playing strength to be a strong, physical runner between the tackles, but is a tough runner with enough strength to run through arm/grab tackles and can keep his feet when he takes hard hits. He's not a tackle breaker, but does consistently gain yards after contact.