That's strange, because whenever I throw a solar grenade at any of the bosses mentioned, they walk away from it. Valus wanders the entire arena, as does Sepikis, the Templar, Sekrion, Atheon, Phogoth, etc. That's why a few of them were able to be cheesed until the baby bumpers were added. These are things the entire community knows about. It's something in the AI. Enemies that are stuck in DoT will path out and away from it. Those that are outside of it won't path into it. There are countless videos that prove what I'm saying. I'd love to see yours.