The Torah tells us that the well in Charan had a rock covering it that was so heavy that it required all the shepherds to remove it.
After they were done they returned the rock.
It would seem that they were guarding the well that nobody used the water unless everybody was there, to ensure fair use.
How then did Yaakov remove the rock and water Lavan's sheep? Who gave him permission to use the water and to remove the rock before everybody had gathered?