"Any other spell than what?" he asked with a sigh. "The killing curse? You don't need that to kill. You've sat in my sessions. You know that anything used properly can kill. I don't even need a spell to kill you right now before you could do so much as draw your wand. But, that's just the point. When we go out there, those are the options we face -- kill, die, or watch others die. All we've done for the last six weeks is watch others die. Merely stepping foot outside these walls is a death sentence. If you don't kill, you will be killed. You don't have to like it. You can serve your penance however you feel you must afterwards. But, if you're not out there ready to kill, if you hesitate because you're looking for another option, you're going to get yourself or whomever you're sent out with killed. It really is that simple."
It went without saying what would happen if Harry's hesitation caused harm to come to someone Remus considered family.
"No, I've got it." He said with a shake of his head, moving another set of three desks. "Doesn't take that long when you can move multiple desks at once with no strain." Standing up straight, he sighed. "It's what friends do, Harry. We unload on each other. You probably should talk to Moody if this is truly this hard for you to accept. But, that doesn't mean you should feel like you can't talk to me."