What happens when you accidentally pour molten slag onto water (or any moisture)

Extreme heat (e.g. 1200C of molten slag) can flash boil water almost immediately upon contact, be it a puddle or even just lightly damp surfaces. There is a lot of expansion if you go from liquid to steam. If the water drips on top of molten metal or slag, most probably it fizzles out (google: Leidenfrost Effect). However, when its molten steel dripping ON TOP of water, the water expands, but has no way to escape other than to violently push the molten steel (upwards) and out of the way. Sometimes you can have high pressure water embedding itself into the hot stuff from the top too. Lots of ways for oopsies to happen No chemical reaction necessary. This is not like hydrocarbon vapors igniting, yet its still a KABOOM!!! Background Song: “Siu Lam Kungfu Hou Ye“ from Shaolin Soccer