Yeah its common. It is all about time vs reward. For some they want the end reward so getting there as fast as possible is imperative to maximum how often then can run a strike. One thing they can do is have the enemies constantly chase you. I don't think they do this in Destiny. I had this once where a player wanted to skip some enemies so we did so and they did not peruse. Reminds me somewhat of WOW where you can run past enemies but they will chase you through the map bringing every other add they cross creating this sort of add pain train.