This is the third and final image in this small series, and in many ways I think this is probably the most dramatic, not least because of the lone figure. And I don't think he was in any immediate danger, other than in terms of getting quite wet, but he's probably got steadier nerves than me :-)

As for the post-processing: though this one looks quite unnatural the redness in the centre of the eruption (for want of a better term) is present in the original; i.e. it's the sand in the water rather than anything I've added to the shot. Clearly, it didn't look quite this red on the day, but nor is it a figment of my post-processing imagination ;-)

Let me know which of the three you preferred.