I think there is a risk/reward thing for returners. They are trusted to make big time decisions that Coaches lose sleep over : )
If the returner can see how the blocking is breaking down and finds it favorable , Coaches want them to take it.
Fine line , and everything in motion ? Of course are moving as fast as can be on returns.
Everyone wants a favorable start to play from on the 1st down. But the reward is sometimes worth the risk of not breaking the 25. Fine lines my friend