"Do you want to wait until your hunger is so great you cannot see the difference between friend or foe?"

Serph keeps his tone matter of fact, without strong emotion in it; for him this is a matter of practicality. Logic to be laid out, even if people by their very nature don't tend to be particularly logical.

"Or do you want to find out while you still have your senses?"

He's not Leo's leader though, so it isn't something he will make him do. In this world, people have choices, choices that he wouldn't take from them, even if the choice may cause him problems later on.