Even after completing most of the lap, it's still an open race. The riders have to be light and nimble, and often they are ladies. There are often less jockeys than reindeer, and thus they race reindeer of different owners.
Another tradition is the lasso competition, which is part of the same event. Lassos are used to catch reindeer and precision is needed to get the loop around their antlers. Here the vertical poles are used as targets. There's a time limit of six minutes for five successful throws from as many distances. The fastest competitor wins.