Zach didn't want to let him go, as if if Colin only stayed with him then he couldn't go off and fight. Then he couldn't die. It was all Zach had then. And he wasn't losing Colin. Not Colin.
"Join?" Zach's voice wavered at a high pitch. He...he wasn't a fighter. And it had been a horrible subject for him over the years. Even his time in the DA hadn't helped him that much, and Zach had been trying. "I...," Zach held on tighter, "wouldn't do anyone any good out there." Zach was fairly sure he'd more likely run away from a death eater than fight one.
Or well, all things considered, get fucked by one.
"Don't do anything too dangerous," Zach practically begged, sniffling a bit.