Loki was too busy staring almost as blankly at Thor's no-longer-slashed arm. Oh, there was still blood, of course, but only what had been left behind when the wound healed.

He'd actually healed something.

Aggravatingly, Loki found he couldn't even tell himself what had been different this time versus the rot or the punch. He'd just... done it, without planning, without paying attention to repeatability, without any actual technique or structure. As breakthroughs went? It seemed worthless. And yet.... "Huh."