What did he measure to figure the arrow's KE, Sylvan? It's velocity or speed of forward motion. Rotational, vibrational, et al. types of motion were not measured and so are excluded by default.
Exactly correct and had he said it the way you just did I wouldn't even had mentioned it but he did specificlly say there were included not excluded so I just pointed out the minor inconsistency.
BTW if you are interested in kinetic pulse here is a very good sight as well. Its about bulltets but the physics is interesting and somewhat analogous to arrows.
http://www.xmission.com/~fractil/math/kp.html
the site Bob gave is the same one you gave me a while ago and I couldn't open it. Still can't.