[ Point one: he's pretty sure they aren't really immortal if they can be broken apart. Point two: even if they can't feel pain or death, there are worse things than that. Such as losing all your limbs and memories, for instance.
Just because you can't feel pain doesn't mean you're never in any danger. You're smart enough to know that, yourself, aren't you?
[ he knows they are... he also knows they're most likely just being difficult because they don't know how to respond to his caring about them, and so, his responses stay light. Lupin might have said he'd give them a hard time, but he doesn't sound the least bit critical - his voice is just teasing. Teasing, and beneath that, concerned, though he's good at hiding that. ]
Worrying doesn't need to be logical, anyway. Sorry to tell you this, but we humans are emotional creatures. You'll have to accept my concern comes from my heart, not my head.
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Just because you can't feel pain doesn't mean you're never in any danger. You're smart enough to know that, yourself, aren't you?
[ he knows they are... he also knows they're most likely just being difficult because they don't know how to respond to his caring about them, and so, his responses stay light. Lupin might have said he'd give them a hard time, but he doesn't sound the least bit critical - his voice is just teasing. Teasing, and beneath that, concerned, though he's good at hiding that. ]
Worrying doesn't need to be logical, anyway. Sorry to tell you this, but we humans are emotional creatures. You'll have to accept my concern comes from my heart, not my head.