The part I have to keep reminding myself is that you see liquid splashing all around, and you have reference with things like ice bucket challenge videos, and think, "OK so it's hot, but other than that, NBD," right? Well, no. That lava may be liquid, but it still weighs just as much as if it was made of stone...because it is.
1gal of water ~8lb (1l = 1kg of course). But lava? Assuming it weighs just as much as basalt (and why wouldn't it?), that means 1gal of lava is gonna weigh almost 3x as much, or ~23lb (1l lava = ~2.8kg), so even if the leidenfrost effect somehow gives you a few extra seconds' time to pull away, getting "splashed" is going to be like getting hit with a red-hot bag of sand.
--Patrick