Time for some logic and simple common sense here... The word "running" is a general, unspecific term that's used to describe when a person travels fast enough on foot that they break out of a walking stride. Unless a person is describing or attaching intent or motive for the persons actions, the term is often used to describe someone who is sprinting, shuffling, jogging, racing, or skipping... Basically it's the preferred, generic term used to label the actions of someone who has purposely increased their foot speed, especially when it's for the purpose of fleeing an area more rapidly.
When Zimmerman was on the phone with police, as well as when he was interviewed by them, the issue of Martin's motive or intent for fleeing was not at issue, so using the generic term "running" to describe his actions more than sufficed. By the time Zimmerman was interviewed by Hannity, that was no longer the case. At that point, Martin's state of mind and motives for fleeing had become an issue, making the general term "running" too broad a term to describe the manner in which Martin fled. What Zimmerman did was use the more defined term "skip" to describe how Martin fled, because it better attested to the level of urgency behind his fleeing.
Zimmerman's using a different, more specific term to describe the manner in which Martin fled, wasn't an inconsistency at all, but rather a necessary clarification designed to better establish Martin's motives, his state of mind at the time, and so that people don't make false assumptions or come to an incorrect conclusion about the level of urgency that he showed.
