My bet is that when it rocks back the first time the pilot is still in control and lowering the collective, therefore when he gets spooked and just shoves the cyclic forward there's not enough collective to get the front of the skids out. I'm guessing that by the time he's going forward for the second time he's already made up his mind to throw that one away (good call !) so the collective is on the way up and the front doesn't dig in this time. On second viewing I do buy the strong tailwind though, there's a gentle oscillation forward as he comes in that looks like it's wind rather than pilot induced.