[He does know, and it comes across silently. It's less about whether or not it's fire, and more about whether he's ready and willing to set himself ablaze to see this done.]

When I was cornered by the Kenoma, I feared for a moment it might be my end. In response... the creature overtook me, taking me as its vessel, body and soul.

It dispensed the Kenoma trivially, with power I barely understand... if it could be utilized, even briefly...

[He's willing to do it, and he's willing to pay for it.]