"I know," Strange responds, with a little nod. "But I—"

And then he cuts himself off. Because Yuya's bleeding. It's from his back, so he doesn't know if Yuya could even have seen it the first place, but that is definitely blood. And weird looking blood at that.

"Stand still for a moment," Strange bosses. Reaching over towards Yuya, he carefully swipes his finger on Yuya's shirt, getting some of the blood on his hand. "You're bleeding. But look at it."

Thankfully, Strange is taller than Yuya. It's easy enough for him to literally move his arm over Yuya's shoulder and hover his hand in range so that Yuya can see the weird, oily, shimmery nature of his new blood.