what does this evidence reveal about dallas?

"We gotta see him," Dally said and flicked out Two-Bit's switchblade. His voice was shaking. "We're gonna see him and if you give me any static you'll end up on your own operatin' table."

and

"Talked the nurse into it with Two-Bit's switch. Don't you know a rumble ain't a rumble unless I'm in it?"