Do you even know what harm it might bring if you can't control that energy? The curse energy is completely different from the standard Mystical energy of this plane without the appropriate knowledge, technique and affinity, one shouldn't even be able to harness it. I don't know if I should be amazed anymore or simply get used to your unusualness".
Irene quipped admitting defeat. From her perspective, Simon shouldn't even be able to survive an encounter with the curse energy, much less be able to harness it.
The fact that he could stay sane even when exposed to it would already be a miracle but to even control the energy, Irene had given up midway and decided to just accept his unusualness.