Elon Musk

[Thumpalumpacus]

With a LOX leak, they're lucky it didn't explode.

Depends on how you define "explode".  If you watch the second stage burn, there was a pretty violent sudden expansion of the reflective protective foil right before the ice crystals started forming out of the "bottom" of it.

I haven't watched the video. On my own knowledge, I know that in the presence of even a little fuel and LOX vaporizing, the aluminum will almost certainly burn too. Aluminum is fuel is a highly oxygenated atmosphere. Perhaps the slipstream pulled the vaporizing LOX away?

A Japanese cruiser at the Battle of Samar had its aluminum superstructure set ablaze by USS Samuel B. Roberts, which out of all HE shells, resorted to firing starshells, which have oxidizer impregnated into them. LOX is much more concentrated than that chemical oxidizer was.

Also, IJN Mikuma was torn apart at the Battle of Midway when an American dive-bomber hit its above-deck torpedoes (which were aerated by LOX) and the explosion leveled the aft of the 600'-long ship: