Well, yeah, I would consider making the top mile or two of crust molten "close enough for government work". I didn't mean dispersing a cloud of debris to infini

Well, yeah, I would consider making the top mile or two of crust molten "close enough for government work". I didn't mean dispersing a cloud of debris to infinity. After the collision that created the Moon, I believe some research suggests that the Earth was literally as hot as the surface of the Sun, deduced from evidence of the effect of "earthshine" on the Moon. If the Chicxulub impactor resulted in a global rain of molten rock, I'd also consider that scale of explosion to be "enough" even though some living things survived.