Rabbits get nervous whenever you stop walking. A rabbit will let you just walk right past them, but if you stop walking they think you spotted them and it will try and run away. I take about ten steps then stop for 5 or 6 seconds, if a rabbit is nearby it will start running 3-4 seconds after you stop walking. Always take a few extra seconds if a spot looks like a good hideout, kick any brush piles you find, and don't be afraid to throw a stick or two if the briar patch is too large to jump on or walk through.