In "The Outsiders" who borrows Two-Bit's switchblade in chapter 7-8?

In "The Outsiders," Chapter 8, (page 133 in my edition) Two-Bit and Ponyboy go to visit Johnny and Dally in the hospital.  When Johnny passes out they go to Dally's room.  He asks about Johnny and when Two-Bit tells him how bad Johnny is, Dally asks,

"Two-Bit, you still got that fancy black-handled switch?" 

"Yea."

"Give it here."

"Two-Bit reached into his back pocket for his prize possession.  It was a jet-handled switchblade, ten inches long, that would flash open at a mere breath...Two-Bit handed it over to Dally without a moment's hesitation.

"We gotta win that fight tonight," Dally said,  His voice was hard. "We gotta get even with the Socs.  For Johnny."

Later Dally tells Ponyboy that he got out of the hospital because the nurse let him leave.  He implied that he had threatened her with the "switch."