[he gives her an apologetic look] I'm sorry. I have only heard others call you by name and assumed. If you tell me your proper name, I will address you by that if you'd prefer. [because personally, Hephaistion is not a fan of nicknames]

[He's quiet as she looks over the plans, letting her form her own opinions on the weapon. He has his own thoughts on the theory behind how something like this could be created... but not the skill to do so. He's smart enough to leave that to the professionals.]

If it interests you, you would be doing me a huge favour to try. I would be in your debt. Whatever you want.