traveling

[just another ref]

Skimming through some of the Olympics on DVR, Spain's semifinal I think. A guy drove the lane and I had the thought: "Not sure exactly what he just did, but no way was it legal." Would I have blown the whistle with the look I had? Yes.
Could I have exactly described the illegal foot movement before I saw the replay? No. I knew, as much as you can know in a case like this, that he had moved both feet after picking up his dribble. (DVR confirmed the call) We have had many discussions recently, regarding traveling among other things, about being certain, being able to explain what you saw to a coach or an assignor, etc. My question is would some refuse to make this call if they were unable to tell exactly how each foot moved? Still trying to find the reason why so many violations are not called. The Olympics was no exception.