Everyone knew that Greek deities had their share of problems with each other. It was like the craziest soap opera that anyone could imagine, so Isis wasn't surprised that they had renegade Hephaestus, even though he probably had the skills to turn the tide of any war.
Regardless, it wasn't time to talk. Since she was a master of magic, Isis healed the wound caused by Hades' attacks in just a few seconds. However, she was aware that things might get messy if he uses something like that again. Still, an attack of that level probably couldn't be used easily, not even by one of the three greatest gods of Greece.