Obito clearly does not want Sasuke to die here, however, the reason Sasuke is in this state is not due to severe injuries, but because he's severely overdrawn his pupil power and life energy.
Sasuke lies on the ground, emitting heavy panting sounds from his mouth, now his entire body's cells are in intense pain, as if his body might be torn apart at any moment, something might burst out at any time.
It's not something else that might burst out, but those refined Hashirama cells.
"You don't seem to understand what's happening."
Su Xiao spoke, Obito indeed has Hashirama cells within him, but he hasn't really understood them.
If under normal circumstances, Sasuke retreats within two hours, the Hashirama cells within his body would rapidly decay, and eventually be excreted through metabolism.
Though this would still largely deplete Sasuke's pupil power, at most it would result in overuse of the Sharingan leading to decreased vision, in the worst case blindness.
