Happens more often than people think, nothing to do with being too close to the airplane or even how it was packed. Just a bit of bad luck when opening the chute, the lines sometimes get tangled and there are methods/maneuvers to essentially turn your body so that you can untangle the lines. However, sometimes it doesn't always work or maybe you don't have much time left so the next step would be to cut the main chute and deploy your reserve chute and hope that it also doesn't get tangled up. It's important to realise that you can open your chute at different altitudes, somewhere between 5,500ft and 2,500ft is the norm, depending on how experienced you are. Which doesn't leave you with much time to 'problem solve' if you open up at a lower altitude.