True, but the tour pros do it without thinking much about it to save time (for decision making).
Either way, he could have been more courteous (re: professional) about it IMO.I think they were still on the tee box and initially I thought Bryson was telling a fan to stop walking. I thought "good luck with that" since there were 1000s crowded along the finishing holes. Regardless, it's common courtesy and sportsmanship to remain silent and otherwise not distract a fellow competitor.
@Eguller - you were correct that this little incident occured when Bryson was hitting an approach from the fairway and I thought I had a mental image it happened on the tee box. I stand corrected! Patrick said they were not 'on the clock' but a tour official had asked them to speed up the pace a little so he had started taking a few steps down the fairway.