Clark's eyes go wide, and on instinct he tries to move forward, but instead of shooting forward at super speed, he stumble forward, catching himself on the wall. He can feel the burn from the additional kryptonite, and it's sapping what little strength he has left.

"Let her go, Slade ..." He says through gritted teeth, his eyes glowing red. He can't risk firing, not just because of Slade's blade, but also because his vision is starting to blur together.